diff --git a/.github/workflows/docker-build-ghcr.yml b/.github/workflows/docker-build-ghcr.yml
new file mode 100644
index 000000000000..6043efd6776a
--- /dev/null
+++ b/.github/workflows/docker-build-ghcr.yml
@@ -0,0 +1,51 @@
+name: Build Docker image to GHCR
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "要构建的分支名"
+        required: true
+        type: string
+        default: "feat/system-prompt-variables"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - name: Check out branch
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5
+        with:
+          ref: ${{ inputs.branch }}
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f
+
+      - name: Log in to GitHub Container Registry
+        uses: docker/login-action@c94ce9fb468520275223c153574b00df6fe4bcc9
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Resolve image tag
+        id: tag
+        run: |
+          REPO=$(echo "${{ github.repository }}" | tr '[:upper:]' '[:lower:]')
+          TAG=$(echo "${{ inputs.branch }}" | tr '[:upper:]' '[:lower:]' | sed 's/[^a-z0-9_.-]/-/g')
+          echo "repo=$REPO" >> "$GITHUB_OUTPUT"
+          echo "tag=$TAG" >> "$GITHUB_OUTPUT"
+          echo "Building image: ghcr.io/${REPO}:$TAG"
+
+      - name: Build & push
+        uses: docker/build-push-action@10e90e3645eae34f1e60eeb005ba3a3d33f178e8
+        with:
+          context: .
+          push: true
+          tags: |
+            ghcr.io/${{ steps.tag.outputs.repo }}:${{ steps.tag.outputs.tag }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
diff --git a/relay/channel/codex/adaptor.go b/relay/channel/codex/adaptor.go
index ef4d4fa04125..45c1ea6c0e6d 100644
--- a/relay/channel/codex/adaptor.go
+++ b/relay/channel/codex/adaptor.go
@@ -13,6 +13,7 @@ import (
 	"github.com/QuantumNous/new-api/relay/channel/openai"
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
 	relayconstant "github.com/QuantumNous/new-api/relay/constant"
+	"github.com/QuantumNous/new-api/relay/helper"
 	"github.com/QuantumNous/new-api/types"
 
 	"github.com/gin-gonic/gin"
@@ -56,7 +57,7 @@ func (a *Adaptor) ConvertOpenAIResponsesRequest(c *gin.Context, info *relaycommo
 	isCompact := info != nil && info.RelayMode == relayconstant.RelayModeResponsesCompact
 
 	if info != nil && info.ChannelSetting.SystemPrompt != "" {
-		systemPrompt := info.ChannelSetting.SystemPrompt
+		systemPrompt := helper.ApplyChannelSystemPromptVariables(info.ChannelSetting.SystemPrompt, info)
 
 		if len(request.Instructions) == 0 {
 			if b, err := common.Marshal(systemPrompt); err == nil {
diff --git a/relay/chat_completions_via_responses.go b/relay/chat_completions_via_responses.go
index 80b124759153..35d61327d500 100644
--- a/relay/chat_completions_via_responses.go
+++ b/relay/chat_completions_via_responses.go
@@ -12,6 +12,7 @@ import (
 	openaichannel "github.com/QuantumNous/new-api/relay/channel/openai"
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
 	relayconstant "github.com/QuantumNous/new-api/relay/constant"
+	"github.com/QuantumNous/new-api/relay/helper"
 	"github.com/QuantumNous/new-api/service"
 	"github.com/QuantumNous/new-api/types"
 
@@ -26,6 +27,7 @@ func applySystemPromptIfNeeded(c *gin.Context, info *relaycommon.RelayInfo, requ
 		return
 	}
 
+	systemPrompt := helper.ApplyChannelSystemPromptVariables(info.ChannelSetting.SystemPrompt, info)
 	systemRole := request.GetSystemRoleName()
 
 	containSystemPrompt := false
@@ -38,7 +40,7 @@ func applySystemPromptIfNeeded(c *gin.Context, info *relaycommon.RelayInfo, requ
 	if !containSystemPrompt {
 		systemMessage := dto.Message{
 			Role:    systemRole,
-			Content: info.ChannelSetting.SystemPrompt,
+			Content: systemPrompt,
 		}
 		request.Messages = append([]dto.Message{systemMessage}, request.Messages...)
 		return
@@ -54,14 +56,14 @@ func applySystemPromptIfNeeded(c *gin.Context, info *relaycommon.RelayInfo, requ
 			continue
 		}
 		if message.IsStringContent() {
-			request.Messages[i].SetStringContent(info.ChannelSetting.SystemPrompt + "\n" + message.StringContent())
+			request.Messages[i].SetStringContent(systemPrompt + "\n" + message.StringContent())
 			return
 		}
 		contents := message.ParseContent()
 		contents = append([]dto.MediaContent{
 			{
 				Type: dto.ContentTypeText,
-				Text: info.ChannelSetting.SystemPrompt,
+				Text: systemPrompt,
 			},
 		}, contents...)
 		request.Messages[i].Content = contents
diff --git a/relay/claude_handler.go b/relay/claude_handler.go
index 527363205a1f..0272520478ea 100644
--- a/relay/claude_handler.go
+++ b/relay/claude_handler.go
@@ -108,21 +108,22 @@ func ClaudeHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *typ
 	}
 
 	if info.ChannelSetting.SystemPrompt != "" {
+		systemPrompt := helper.ApplyChannelSystemPromptVariables(info.ChannelSetting.SystemPrompt, info)
 		if request.System == nil {
-			request.SetStringSystem(info.ChannelSetting.SystemPrompt)
+			request.SetStringSystem(systemPrompt)
 		} else if info.ChannelSetting.SystemPromptOverride {
 			common.SetContextKey(c, constant.ContextKeySystemPromptOverride, true)
 			if request.IsStringSystem() {
 				existing := strings.TrimSpace(request.GetStringSystem())
 				if existing == "" {
-					request.SetStringSystem(info.ChannelSetting.SystemPrompt)
+					request.SetStringSystem(systemPrompt)
 				} else {
-					request.SetStringSystem(info.ChannelSetting.SystemPrompt + "\n" + existing)
+					request.SetStringSystem(systemPrompt + "\n" + existing)
 				}
 			} else {
 				systemContents := request.ParseSystem()
 				newSystem := dto.ClaudeMediaMessage{Type: dto.ContentTypeText}
-				newSystem.SetText(info.ChannelSetting.SystemPrompt)
+				newSystem.SetText(systemPrompt)
 				if len(systemContents) == 0 {
 					request.System = []dto.ClaudeMediaMessage{newSystem}
 				} else {
diff --git a/relay/compatible_handler.go b/relay/compatible_handler.go
index a68cfe730f60..1e04c7c2bcc8 100644
--- a/relay/compatible_handler.go
+++ b/relay/compatible_handler.go
@@ -113,7 +113,7 @@ func TextHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *types
 		relaycommon.AppendRequestConversionFromRequest(info, convertedRequest)
 
 		if info.ChannelSetting.SystemPrompt != "" {
-			// 如果有系统提示，则将其添加到请求中
+			systemPrompt := helper.ApplyChannelSystemPromptVariables(info.ChannelSetting.SystemPrompt, info)
 			request, ok := convertedRequest.(*dto.GeneralOpenAIRequest)
 			if ok {
 				containSystemPrompt := false
@@ -127,7 +127,7 @@ func TextHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *types
 					// 如果没有系统提示，则添加系统提示
 					systemMessage := dto.Message{
 						Role:    request.GetSystemRoleName(),
-						Content: info.ChannelSetting.SystemPrompt,
+						Content: systemPrompt,
 					}
 					request.Messages = append([]dto.Message{systemMessage}, request.Messages...)
 				} else if info.ChannelSetting.SystemPromptOverride {
@@ -136,13 +136,13 @@ func TextHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *types
 					for i, message := range request.Messages {
 						if message.Role == request.GetSystemRoleName() {
 							if message.IsStringContent() {
-								request.Messages[i].SetStringContent(info.ChannelSetting.SystemPrompt + "\n" + message.StringContent())
+								request.Messages[i].SetStringContent(systemPrompt + "\n" + message.StringContent())
 							} else {
 								contents := message.ParseContent()
 								contents = append([]dto.MediaContent{
 									{
 										Type: dto.ContentTypeText,
-										Text: info.ChannelSetting.SystemPrompt,
+										Text: systemPrompt,
 									},
 								}, contents...)
 								request.Messages[i].Content = contents
diff --git a/relay/gemini_handler.go b/relay/gemini_handler.go
index 8f64552a696d..3e3f8f7334ba 100644
--- a/relay/gemini_handler.go
+++ b/relay/gemini_handler.go
@@ -96,14 +96,15 @@ func GeminiHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *typ
 	adaptor.Init(info)
 
 	if info.ChannelSetting.SystemPrompt != "" {
+		systemPrompt := helper.ApplyChannelSystemPromptVariables(info.ChannelSetting.SystemPrompt, info)
 		if request.SystemInstructions == nil {
 			request.SystemInstructions = &dto.GeminiChatContent{
 				Parts: []dto.GeminiPart{
-					{Text: info.ChannelSetting.SystemPrompt},
+					{Text: systemPrompt},
 				},
 			}
 		} else if len(request.SystemInstructions.Parts) == 0 {
-			request.SystemInstructions.Parts = []dto.GeminiPart{{Text: info.ChannelSetting.SystemPrompt}}
+			request.SystemInstructions.Parts = []dto.GeminiPart{{Text: systemPrompt}}
 		} else if info.ChannelSetting.SystemPromptOverride {
 			common.SetContextKey(c, constant.ContextKeySystemPromptOverride, true)
 			merged := false
@@ -111,12 +112,12 @@ func GeminiHelper(c *gin.Context, info *relaycommon.RelayInfo) (newAPIError *typ
 				if request.SystemInstructions.Parts[i].Text == "" {
 					continue
 				}
-				request.SystemInstructions.Parts[i].Text = info.ChannelSetting.SystemPrompt + "\n" + request.SystemInstructions.Parts[i].Text
+				request.SystemInstructions.Parts[i].Text = systemPrompt + "\n" + request.SystemInstructions.Parts[i].Text
 				merged = true
 				break
 			}
 			if !merged {
-				request.SystemInstructions.Parts = append([]dto.GeminiPart{{Text: info.ChannelSetting.SystemPrompt}}, request.SystemInstructions.Parts...)
+				request.SystemInstructions.Parts = append([]dto.GeminiPart{{Text: systemPrompt}}, request.SystemInstructions.Parts...)
 			}
 		}
 	}
diff --git a/relay/helper/channel_system_prompt.go b/relay/helper/channel_system_prompt.go
new file mode 100644
index 000000000000..8c8621ae53f9
--- /dev/null
+++ b/relay/helper/channel_system_prompt.go
@@ -0,0 +1,22 @@
+package helper
+
+import (
+	"strings"
+
+	"github.com/QuantumNous/new-api/common"
+	relaycommon "github.com/QuantumNous/new-api/relay/common"
+	"github.com/QuantumNous/new-api/setting/system_setting"
+)
+
+func ApplyChannelSystemPromptVariables(systemPrompt string, info *relaycommon.RelayInfo) string {
+	if systemPrompt == "" {
+		return systemPrompt
+	}
+	result := systemPrompt
+	result = strings.ReplaceAll(result, "{site_name}", common.SystemName)
+	result = strings.ReplaceAll(result, "{site_url}", system_setting.ServerAddress)
+	if info != nil && info.OriginModelName != "" {
+		result = strings.ReplaceAll(result, "{model_name}", info.OriginModelName)
+	}
+	return result
+}
diff --git a/web/default/src/features/channels/components/drawers/channel-mutate-drawer.tsx b/web/default/src/features/channels/components/drawers/channel-mutate-drawer.tsx
index 383d1aee5c2f..5c897fda33bb 100644
--- a/web/default/src/features/channels/components/drawers/channel-mutate-drawer.tsx
+++ b/web/default/src/features/channels/components/drawers/channel-mutate-drawer.tsx
@@ -4157,6 +4157,10 @@ export function ChannelMutateDrawer({
                                     {t(
                                       'Default system prompt for this channel'
                                     )}
+                                    <br />
+                                    <span className='text-muted-foreground'>
+                                      {t('Available variables')}: {'{model_name}'}, {'{site_name}'}, {'{site_url}'}
+                                    </span>
                                   </FormDescription>
                                   <FormMessage />
                                 </FormItem>
diff --git a/web/default/src/i18n/locales/en.json b/web/default/src/i18n/locales/en.json
index 70d3140533e6..3eb353468ed4 100644
--- a/web/default/src/i18n/locales/en.json
+++ b/web/default/src/i18n/locales/en.json
@@ -520,6 +520,7 @@
     "Automatically sync model list when upstream changes are detected": "Automatically sync model list when upstream changes are detected",
     "Availability (last 24h)": "Availability (last 24h)",
     "Available": "Available",
+    "Available variables": "Available variables",
     "Available credits are ordered by soonest expiration.": "Available credits are ordered by soonest expiration.",
     "Available disk space": "Available disk space",
     "Available Models": "Available Models",
diff --git a/web/default/src/i18n/locales/zh.json b/web/default/src/i18n/locales/zh.json
index 92f52151eefb..c7d28e88c5a8 100644
--- a/web/default/src/i18n/locales/zh.json
+++ b/web/default/src/i18n/locales/zh.json
@@ -520,6 +520,7 @@
     "Automatically sync model list when upstream changes are detected": "检测到上游模型变更时自动同步模型列表",
     "Availability (last 24h)": "可用率（最近 24 小时）",
     "Available": "可用",
+    "Available variables": "可用变量",
     "Available credits are ordered by soonest expiration.": "可用次数按最早到期排序。",
     "Available disk space": "可用磁盘空间",
     "Available Models": "可用模型",