With regard to the solution to the assignment problems with “tasks more than the number of persons”, there are many solving methods such as “adding rows with zeros”, adding rows with minimum value”[2], the whole idea of all these methods mentioned above is to solve the problems by transforming them into standard assignment problems, therefore, this paper proposes a difference method different from traditional solving methods, this method, which is simple, visual and better than traditional algorithms, does not need to use new matrix to replace original coefficient matrix at the beginning but directly solves the problems on the original coefficient matrix.