Based on linear intersect

the graphic user program of reactivity ratio of two-component copolymerization calculation was designed according to least squares principle by using Matlab GUI in the paper. Compared with traditional approaches of reactivity ratio' solution

this graphical user program has the characteristics of simple design principle and fast computation. In addition

the terse interface

friendly interaction and practical input platform was provided by Program. The results of actual application indicated that the data by using graphic user program are closed to the value which calculated by microcomputer dynamic search method and Tidwell-Mortimer method

and much more smaller minimum sum of squares of deviations than using slope-intercept method. Avoiding the inconsistency of calculation result which caused by equation asymmetry of slope-intercept method.