Abstract: In the linear titrations, two methods arc commonly used, the graphic method and the calculating method. The present paper describes a new method on the basis of the graphic method, namely, graphic regressive method. According to this mcthod, the graphs are drawn by microcomputer, and the results are obtained by the use of linear regression equations. Thus, the present method saves both time and labour compared with the former two methods. By appling this method to determine several very weak acids and weak acid mixture,we obtained satisfactory results in all cases.