Objective:To explore the approach to analyzing simple effect on factorial design with SAS.Methods:The mean square of error coming from factorial design was considered as standard error(SE)

and simple effect analysis under Contrast statement in GLM was conducted by designing the contrast coefficient matrix of the parameter

and SAS program was realized based on an example of 3-way factorial design.Results:he procedures of designing the contrast coefficient matrix of the pa-rameter were achieved.Conclusion:It is convenient and feasible to conduct simple effect analysis under Contrast statement by constructing design matrix.