The study aims to understand the inclusive attitude by the senior-graders in elementary school toward the classmates of intellectual disability. The study explores that the difference of the inclusive attitudes by the senior-graders in elementary school toward the classmates of intellectual disability under different background variables (such as gender, grade, contact level, whether serving as an officer in the class or not, academic performance, the social and economic status of the family etc.), predicting ability of the inclusive attitude by the students in elementary school toward the classmates of intellectual disability under different background variables, and present viewpoints and make suggestions based on the research results to provide reference for inclusive education development of the elementary school in the future. The study adopts the questionnaire survey method in the research method, develops research framework by referring to internal and external relative literature, and develops ¡§the questionnaire survey of the peer inclusive attitude by the senior-graders in Chao Shiang Elementary School in Kaohsiung County¡¨, wherein by ¡§personal basic information¡¨, ¡§the learning acceptance attitude by the peers¡¨, ¡§the support acceptance attitude by the peers¡¨ and ¡§the friendship acceptance attitude by the peers¡¨ etc., the inclusive attitude scale by the students in Chao Shiang Elementary School toward the classmates of intellectual disability, the study understands the sample property and compares the difference of the inclusive attitudes by the students of different backgrounds toward the classmates of intellectual disability after basic information of the subjects is collected. The study makes a sampling survey after completion of the questionnaire and utilizes the unsimplified Chinese version of the statistic package software SPSS FOR WINDOW 10.0 and the statistic package software Excel 2003 to make a statistic analysis of sampling data to present research conclusions and make research suggestions after completion of survey. The study takes the senior-graders studying in Chao Chiang Elementary School in Kaohsiung County as research objects and adopts the disproportional stratified random sampling method to test a sampling. The study sends out 210 questionnaires to collect questionnaire information, recovers 207 questionnaires (the recovery rate is 98.57%), and 205 valid samples are finally acquired (the valid recovery rate is 97.62%) after invalid questionnaires are deleted. The study finds: The learning acceptance attitude by the senior-graders in Chao Chiang Elementary School in Kaohsiung County toward the classmates of intellectual disability tends to be aggressive and positive. The support acceptance attitude by the senior-graders in Chao Chiang Elementary School in Kaohsiung County toward the classmates of intellectual disability tends to be aggressive and positive. The friendship acceptance attitude by the senior-graders in Chao Chiang Elementary School in Kaohsiung County toward the classmates of intellectual disability tends to be aggressive and positive. The background variables of the senior-graders in Chao Chiang Elementary School in Kaohsiung County don¡¦t have significant difference, no matter in gender, grade, contact level, whether serving as an officer in the class or not, academic performance, the social and economic status of the family. The inclusive attitude scale in the learning acceptance attitude by the peers, the support acceptance attitude by the peers and the friendship acceptance attitude by the peers does not have predicting ability. Besides, the study also finds that the contact level between the subject students in Chao Chiang Elementary School and the classmates of intellectual disability is very high. Because Chao Chiang Elementary School has implemented inclusive education for a period of time, the subject students are somewhat familiar with the classmates of intellectual disability, which may be also one of the reasons which the acceptance attitude by the students generally tends to be aggressive and positive. Finally, the study makes suggestions to provide reference for the authority concerned, school, teachers, and future research based on the findings and generalized conclusions of the study.