diff --git a/AstroLib/Src/AsAttitudeParam_2023.cpp b/AstroLib/Src/AsAttitudeParam_2023.cpp
index 4a05eb0518f8d332e83ea8f6c13ef6161dcb3b0c..78d413bcd373dd7c3deccf37c28fe1ff3fd90d5b 100644
--- a/AstroLib/Src/AsAttitudeParam_2023.cpp
+++ b/AstroLib/Src/AsAttitudeParam_2023.cpp
@@ -656,4 +656,41 @@ void AsMtxToEuler132(const CMatrix<double>& mtx, CEuler& euler)
 		euler.m_Angle2 = asin(-mtx[1][0]);
 		euler.m_Angle3 = atan2(mtx[2][0] / cbeta, mtx[0][0] / cbeta);
 	}
+}
+
+///***********************************************************************
+/// 方向余弦矩阵转为212转序Euler角
+/// @Author	Chang Xiaokuan
+/// @Date	2025.2.28
+/// @Input
+/// @Param	mtx		坐标转移矩阵
+/// @Output
+/// @Param	euler	欧拉角(rad)
+///***********************************************************************
+void AsMtxToEuler212(const CMatrix<double>& mtx, CEuler& euler)
+{	
+	double epsilon = 1e-8;
+	double theta = 0, psi = 0, phi = 0;
+	theta = acos(mtx[1][1]);
+	if (fabs(sin(theta)) < epsilon)
+	{
+		if (fabs(theta) < epsilon)
+		{
+			phi = 0;
+			psi = atan2(mtx[0][2], mtx[0][0]);
+		}
+		else //theta == pi
+		{
+			psi = 0;
+			phi = atan2(-mtx[0][2], mtx[0][0]);
+		}
+	}
+	else //sin(theta) != 0
+	{
+		psi = atan2(mtx[1][0], -mtx[1][2]);
+		phi = atan2(mtx[0][1], mtx[2][1]);
+	}
+	euler.m_Angle1 = phi;
+	euler.m_Angle2 = theta;
+	euler.m_Angle3 = psi;
 }
\ No newline at end of file