diff --git a/docs/source/sls/algorithm.rst b/docs/source/sls/algorithm.rst
index 5d9a2156fae3fb11d3e5f68218efb8cab8e8cdd8..a63e7b1773fd7654251574033a7c03d3c6472aa2 100644
--- a/docs/source/sls/algorithm.rst
+++ b/docs/source/sls/algorithm.rst
@@ -105,7 +105,7 @@ reference file: readnoise file
 
 ERR数据单元构造误差数据，该步误差公式：
 
-:raw-math:`$$ \sigma = \sqrt{(SCI-bias)+{\sigma_bias}^2 + readnoise^2)} $$`
+:raw-math:$ \sigma = \sqrt{(SCI-bias)+{\sigma_bias}^2 + readnoise^2)} $
 
 
 **Dark correction**