diff --git a/AstroLib/Src/AsAttitudeParam_2023.cpp b/AstroLib/Src/AsAttitudeParam_2023.cpp
index cde58dbbbc41a02c4ca39882049ff9139585d0a2..88d9c412506d71f0bdd99352f39a6db8a57eaf93 100644
--- a/AstroLib/Src/AsAttitudeParam_2023.cpp
+++ b/AstroLib/Src/AsAttitudeParam_2023.cpp
@@ -761,25 +761,27 @@ void AsMtxToEuler212(const CMatrix<double>& mtx, CEuler& euler)
 	}
 }
 
-
+///***********************************************************************
+/// 方向余弦矩阵转为121转序Euler角
+/// @Author  Ma Zihui
+/// @Date	20235.3
+/// @Input
+/// @Param	mtx		坐标转移矩阵
+/// @Output
+/// @Param	euler	欧拉角(rad)
+///***********************************************************************
 void AsMtxToEuler121(const CMatrix<double> &mtx,
-					 CEuler &euler)
 	CEuler &euler)
 {
-	// euler.m_Angle1 = atan2(mtx[0][1], -mtx[0][2]);
-	// euler.m_Angle2 = acos(mtx[0][0]);
-	// euler.m_Angle3 = atan2(mtx[1][0], mtx[2][0]);
-
 	if (fabs(mtx[0][0]) != 1)
 	{
 		euler.m_Angle1 = atan2(mtx[0][1], -mtx[0][2]);
-    }
-
+		euler.m_Angle2 = acos(mtx[0][0]);
+		euler.m_Angle3 = atan2(mtx[1][0], mtx[2][0]);
+	}
 	else
 	{
 		euler.m_Angle1 = 0;
-		double summ = atan2(mtx[1][1], mtx[1][2]);
-		if (mtx[2][0] == -1)
 		double summ = atan2(-mtx[2][1], mtx[1][1]);
 		if (mtx[0][0] == -1)
 		{