A method for compensating an effect of a patterning process is illustrated. The main concept of the method for compensating the effect of the patterning process is to add or subtract the correction amounts for all segments according to the set of the comparison values at the set of the evaluation points. Compared with the delta-chrome optical proximity correction method, the run time of the method for compensating the effect of the patterning process is reduced, the memory usage of the method for compensating the effect of the patterning process not increased, and the correction accuracy of the method for compensating the effect of the patterning process is not reduced.