【摘要】 利用渐近方法，直接由Ｌａｇｒａｎｇｅ常数变易法求解含微扰项的Ｓｔｕｒｍ－Ｌｉｏｕｖｉｌｅ本征值问题．最后举一实例证明，与传统的展开法（结果为无穷多项）相比较，两种方法完全一致，等价，适用范围也相同，而且本文所述方法简明（一般只含两项）更具有一定的物理意义更多还原

【Abstract】 In this paper,we solve Sturm Liouville eigenvalue problem with perturbation term by method of Lagrange variation of constants and asymptotic method.Comparing with ordinary expansion method,results and applicable range are same in two methods.At last we give an example to explain and compare.更多还原