diff --git a/tester/base.py b/tester/base.py
index 59caac64..55557ea4 100644
--- a/tester/base.py
+++ b/tester/base.py
@@ -594,6 +594,7 @@ def get_arg(api_config, arg_pos, arg_name, default=None):
 # some accuracy error can be considered tolerable
 special_accuracy_atol_rtol = {
     # "API": (atol, rtol),
+    "paddle.incubate.nn.functional.fused_bias_act": (1, 1e-2)
 }
 
 torch_error_skip = frozenset(
diff --git a/tester/paddle_to_torch/rules.py b/tester/paddle_to_torch/rules.py
index 7d579ae9..d97bc1af 100644
--- a/tester/paddle_to_torch/rules.py
+++ b/tester/paddle_to_torch/rules.py
@@ -1866,6 +1866,17 @@ def fused_bias_act(
 ) -> torch.Tensor:
     import torch.nn.functional as F
 
+    def swiglu(x):
+        x, gate = x.chunk(2, dim=-1)
+        return x * torch.sigmoid(x) * gate
+
+    def geglu(x):
+        x, gate = x.chunk(2, dim=-1)
+        return F.gelu(x) * gate
+    
+    if dequant_scales is not None:
+        x = x * dequant_scales
+
     if compute_dtype != 'default':
         if compute_dtype == 'fp16':
             compute_dtype = 'float16'
@@ -1877,30 +1888,10 @@ def fused_bias_act(
             x = x.to(getattr(torch, compute_dtype))
     else:
         x = x.float() if not x.is_floating_point() else x
-    if dequant_scales is not None:
-        dequant_scales = dequant_scales.to(x.dtype)
-        x = x * dequant_scales
+
     if bias is not None:
         bias = bias.to(x.dtype)
         x = x + bias
-    if shift is not None:
-        repeat_factor = x.shape[-1] // shift.shape[-1]
-        shift = shift.repeat(repeat_factor)
-        shift = shift.to(x.dtype)
-        x = x + shift
-    if smooth is not None:
-        repeat_factor = x.shape[-1] // smooth.shape[-1]
-        smooth = smooth.repeat(repeat_factor)
-        smooth = smooth.to(x.dtype)
-        x = x * smooth
-
-    def swiglu(x):
-        x, gate = x.chunk(2, dim=-1)
-        return x * torch.sigmoid(x) * gate
-
-    def geglu(x):
-        x, gate = x.chunk(2, dim=-1)
-        return F.gelu(x) * gate
 
     act_method = act_method.lower()
     if act_method == 'gelu':
@@ -1917,17 +1908,31 @@ def geglu(x):
         x = geglu(x)
     else:
         raise ValueError(f"Unsupported activation method: {act_method}")
+    
+    if shift is not None:
+        repeat_factor = x.shape[-1] // shift.shape[-1]
+        shift = shift.repeat(repeat_factor)
+        shift = shift.to(x.dtype)
+        x = x + shift
+
+    if smooth is not None:
+        repeat_factor = x.shape[-1] // smooth.shape[-1]
+        smooth = smooth.repeat(repeat_factor)
+        smooth = smooth.to(x.dtype)
+        x = x * smooth
 
     if quant_scale > 0:
-        x = x / quant_scale
+        x = quant_max_bound * quant_scale * x
         if quant_round_type == 0:
-            x = torch.round(x)  # Round to nearest, ties to even
+            x = torch.round(x)
         elif quant_round_type == 1:
             x = torch.where(x >= 0, torch.ceil(x - 0.5), torch.floor(x + 0.5))
         else:
             raise ValueError(f"Unsupported quant_round_type: {quant_round_type}")
-        x = x * quant_scale
         x = torch.clamp(x, min=quant_min_bound, max=quant_max_bound)
+        
+        x = x.to(torch.int8)
+
     return x
 """
         core = "result = fused_bias_act(**kwargs)"