Through the analysis of the basis point method and the average advanced score method in functional evaluation, and combining the advantages of the two, a new functional evaluation method, namely the average point score method, is proposed. The basic idea is to treat multiple representative functional units as base points, calculate the corresponding average cost or score, and then use this as a standard to find the target cost and value coefficient of other functions. Finally, the results of each functional evaluation method only indicate the direction of improvement of the product or operation, and cannot be equated with the actual problem. Failure to do so will result in an error.