On "Ability to pay tax principle" in terms of the development of the situation, theoretical and practical (especially the Department of Grand Justices interpretation) now have recognized the principle of the existence of the principle, and then, what's the relation between the principles and the law principle of taxation? How to deal with the fact, that is correspond to the elements of tax. The literature seems to have no detailed discussion and explanation. And how the principle of "Ability to pay tax principle" on specific operations on the contentious taxes should operate on the analysis of empirical data are not optimistic. Therefore, this article deals with "Ability to pay tax principle" in the title, in relation to the connotation and operate on the principle of action for the observed objects in order to continue the process by the principle of minimizing the related disputes or problems, and then in furtherance for taxpayers basic human rights to be maintained.