diff --git a/AstroLib/Include/AsAttitudeParam_2023.h b/AstroLib/Include/AsAttitudeParam_2023.h
index 8dbbf6a9682afd3ee9062c7db88d0db6bcb4e1a5..2bbf777ea012bc7ca88d52d1611d32426c7eb15b 100644
--- a/AstroLib/Include/AsAttitudeParam_2023.h
+++ b/AstroLib/Include/AsAttitudeParam_2023.h
@@ -30,6 +30,17 @@ void	AsMtxToAxAng(const CMatrix<double>& mtx, CCoord& axis, double& angle);
 ///***********************************************************************
 bool	AsQuatToEuler123(const CQuaternion& q, CEuler& euler);
 
+///***********************************************************************
+///将四元数转化成欧拉角_213转序
+/// @Author	Kong Lingyue
+/// @Date	2025.03.10
+/// @Input
+/// @Param	q		标准化四元数
+/// @Output
+/// @Param	euler		欧拉角(rad)
+///***********************************************************************
+bool	AsQuatToEuler213(const CQuaternion& q, CEuler& euler);
+
 ///***********************************************************************
 /// 方向余弦阵转321转序欧拉角
 /// @Author	Li Sibei