diff --git a/docs/source/sls/algorithm.rst b/docs/source/sls/algorithm.rst
index a2898be09713ddd2d573966a2c509635e4c91085..5c3111610cb7a453904a0c1ebcf878efc0700004 100644
--- a/docs/source/sls/algorithm.rst
+++ b/docs/source/sls/algorithm.rst
@@ -104,10 +104,7 @@ ERR数据单元构造误差数据，该步误差公式：
 
 .. math::
 
-\begin{displaymath}
     v = {\sigma}_1 \cdot {\sigma}_2
-    {\tau}_1 \cdot {\tau}_2
-\end{displaymath}
 
 \sigma = \sqrt{((SCI-bias)+\sigma^2 + readnoise^2)}
 **Dark correction**