The major purpose of this study was to compare the effects of two difference Chinese radicals teaching on students with intellectual disabilities in elementary school. The methodology adopted in this study was alternating treatment design of single subject experimental, including initial baseline, alternating and the follow-up phase. Whit intervention, 2 instruction were conducted alternately. The experiment instruction was implemented for 6 weeks. The participants of this experiment were elementary school students with intellectual disabilities. The effectiveness of intervention was immediately, and one week later assessed. The date was analyzed by the method of visual analysis. The main findings were as follows: 1. As for the immediate effects, three student performed better in provide the pre-coursework study before the class. 2. As for the maintenance effects, three students performed better in provide the pre-coursework study before the class.