构建准精确可解问题的方法有很多，例如超对称方法、Darboux方法、李代数方法等，但是这些方法构建的准精确可解问题往往得到的是多项式型的波函数.我们从一类含参变化的双势阱出发，研究了和参数相关的性质，并且发现了一种构建QES势的方法，这种方法构建的QES势有李代数结构，但波函数的形式是非多项式.

 There are many approachs to construct quasi-exact solvable problems, such as supersymmetric method, Darboux method, Lie algebra method, etc., but the quasi-exact solvable problems constructed by these methods are often polynomial wave functions. Starting from a class of double well with parametric variation, we study the properties related to the parameters, and find a method to construct QES potential. The QES potential constructed by this method has Lie algebraic structure, but the form of the wave function is non-polynomial.