diff --git a/develop/api_doc/v2/fluid/layers.html b/develop/api_doc/v2/fluid/layers.html
index 40cc30fedc3199fee6a55906369d966c1a6dd1cc..54d3c11f384227d34275a35c79d64f3b5b0b9e86 100644
--- a/develop/api_doc/v2/fluid/layers.html
+++ b/develop/api_doc/v2/fluid/layers.html
@@ -1053,7 +1053,7 @@ a biases variable will be created and added to the output. Finally,
 if activation is not None, it will be applied to the output as well.</p>
 <p>This process can be formulated as follows:</p>
 <div class="math">
-\[Out = Act({\sum_{i=0}^{N-1}W_iX_i + b})\]</div>
+\[Out = Act({\sum_{i=0}^{N-1}X_iW_i + b})\]</div>
 <p>In the above equation:</p>
 <ul class="simple">
 <li><span class="math">\(N\)</span>: Number of the input.</li>
diff --git a/develop/doc/api/v2/fluid/layers.html b/develop/doc/api/v2/fluid/layers.html
index 2b9d52e20cc1fd22dc267cc04ea3befb1e9baebf..40bff2f4b020743f5ba46319a951eaa45cadc39c 100644
--- a/develop/doc/api/v2/fluid/layers.html
+++ b/develop/doc/api/v2/fluid/layers.html
@@ -1103,7 +1103,7 @@ a biases variable will be created and added to the output. Finally,
 if activation is not None, it will be applied to the output as well.</p>
 <p>This process can be formulated as follows:</p>
 <div class="math">
-\[Out = Act({\sum_{i=0}^{N-1}W_iX_i + b})\]</div>
+\[Out = Act({\sum_{i=0}^{N-1}X_iW_i + b})\]</div>
 <p>In the above equation:</p>
 <ul class="simple">
 <li><span class="math">\(N\)</span>: Number of the input.</li>
diff --git a/develop/doc_cn/api/v2/fluid/layers.html b/develop/doc_cn/api/v2/fluid/layers.html
index ef9edd6e3a8f75b7dd71671e3991a2d8452887cd..559fb299f2a7bc359908bd0904affcac125544c5 100644
--- a/develop/doc_cn/api/v2/fluid/layers.html
+++ b/develop/doc_cn/api/v2/fluid/layers.html
@@ -1122,7 +1122,7 @@ a biases variable will be created and added to the output. Finally,
 if activation is not None, it will be applied to the output as well.</p>
 <p>This process can be formulated as follows:</p>
 <div class="math">
-\[Out = Act({\sum_{i=0}^{N-1}W_iX_i + b})\]</div>
+\[Out = Act({\sum_{i=0}^{N-1}X_iW_i + b})\]</div>
 <p>In the above equation:</p>
 <ul class="simple">
 <li><span class="math">\(N\)</span>: Number of the input.</li>