Abstract: This paper uses estimation of the trigonomitric sums and character sums and the analytic method to study the 2k-th power mean of the inversion of Dirichlet L-functions with the weight of Gauss sums.It is proved that when integer q≥2,real number Q＞1,for the arbitrary positive integers k and m,and (m,ｑ≤Ｑｑ)＝１，the power mean value formula is given as:ｑ≤Ｑ(Ａｋ（ｑ）)/(φ２（ｑ）)ｘｍｏｄ　ｑ(｜Ｇ（ｍ，ｑ）｜２)/(｜Ｌ（１，ｘ）｜２ｋ)＝（１５/π２）ｋＱ＋Ｏ（Ｑ1/2＋ε）．

Key words: Dirichlet L-functions, character sums, distribution of the mean value, Gauss sums