diff --git a/contrib/drivers/pgsql/pgsql_table_fields.go b/contrib/drivers/pgsql/pgsql_table_fields.go
index 83b344aba93..22155b41b9e 100644
--- a/contrib/drivers/pgsql/pgsql_table_fields.go
+++ b/contrib/drivers/pgsql/pgsql_table_fields.go
@@ -17,7 +17,7 @@ import (
 var (
 	tableFieldsSqlTmp = `
 SELECT a.attname AS field, t.typname AS type,a.attnotnull as null,
-    (case when d.contype is not null then 'pri' else '' end)  as key
+    (case when d.contype = 'p' then 'pri' when d.contype = 'u' then 'uni' else '' end)  as key
       ,ic.column_default as default_value,b.description as comment
       ,coalesce(character_maximum_length, numeric_precision, -1) as length
       ,numeric_scale as scale
diff --git a/contrib/drivers/pgsql/pgsql_z_unit_issue_test.go b/contrib/drivers/pgsql/pgsql_z_unit_issue_test.go
new file mode 100644
index 00000000000..0a0f3869ff8
--- /dev/null
+++ b/contrib/drivers/pgsql/pgsql_z_unit_issue_test.go
@@ -0,0 +1,75 @@
+// Copyright GoFrame Author(https://goframe.org). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package pgsql_test
+
+import (
+	"fmt"
+	"github.com/gogf/gf/v2/database/gdb"
+	"testing"
+
+	"github.com/gogf/gf/v2/frame/g"
+	"github.com/gogf/gf/v2/os/gtime"
+	"github.com/gogf/gf/v2/test/gtest"
+)
+
+// https://github.com/gogf/gf/issues/3330
+func Test_Issue3330(t *testing.T) {
+	var (
+		table      = fmt.Sprintf(`%s_%d`, TablePrefix+"test", gtime.TimestampNano())
+		uniqueName = fmt.Sprintf(`%s_%d`, TablePrefix+"test_unique", gtime.TimestampNano())
+	)
+	if _, err := db.Exec(ctx, fmt.Sprintf(`
+		CREATE TABLE %s (
+		   	id bigserial  NOT NULL,
+		   	passport varchar(45) NOT NULL,
+		   	password varchar(32) NOT NULL,
+		   	nickname varchar(45) NOT NULL,
+		   	create_time timestamp NOT NULL,
+		   	PRIMARY KEY (id),
+			CONSTRAINT %s unique ("password")
+		) ;`, table, uniqueName,
+	)); err != nil {
+		gtest.Fatal(err)
+	}
+	defer dropTable(table)
+
+	gtest.C(t, func(t *gtest.T) {
+		var (
+			list []map[string]interface{}
+			one  gdb.Record
+			err  error
+		)
+
+		fields, err := db.TableFields(ctx, table)
+		t.AssertNil(err)
+
+		t.Assert(fields["id"].Key, "pri")
+		t.Assert(fields["password"].Key, "uni")
+
+		for i := 1; i <= 10; i++ {
+			list = append(list, g.Map{
+				"id":          i,
+				"passport":    fmt.Sprintf("p%d", i),
+				"password":    fmt.Sprintf("pw%d", i),
+				"nickname":    fmt.Sprintf("n%d", i),
+				"create_time": "2016-06-01 00:00:00",
+			})
+		}
+
+		_, err = db.Model(table).Data(list).Insert()
+		t.AssertNil(err)
+
+		for i := 1; i <= 10; i++ {
+			one, err = db.Model(table).WherePri(i).One()
+			t.AssertNil(err)
+			t.Assert(one["id"], list[i-1]["id"])
+			t.Assert(one["passport"], list[i-1]["passport"])
+			t.Assert(one["password"], list[i-1]["password"])
+			t.Assert(one["nickname"], list[i-1]["nickname"])
+		}
+	})
+}