本文采用作用角变量的方法，讨论了闭合轨道在一般幂次型引力势作用下的情况。
On the basis of the method of action-angle variables the conditions of closed orbits under the action of general power-type gravitation potential are discussed on this paper.
通常是将求一般矩阵的方幂转化为求对角矩阵的方幂。
Seeking a power of general matrix is often through seeking a power of diagonal matrix .
在矩阵元素的高次多项式中，任一变元的幂次不得高于9次，矩阵元素最大的字符串长度一般在2500左右。
Any of the high order polynomials of the matrix elements should not be higher than 9 degrees, and, in general, the maximum string length of matrix elements is about 2500.
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