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Abstract: The purpose of this research project is to collect experimental datafor further investigation of the benefit of early intervention of preschool-aged mentally retarded children. It has three parts: (1)to testify the effe-ctiveness of an early intervention program; (2)to identify the psypholo-gical characteristics and behavior disorders of these retarded children; (3)to find out factors related closely to children's learning progress. Twenty mentally retarded children(2-7 years old)participated in thisprogram. The results of one-year intervention show that this programis effective in a few ways. 17 of 20 subjects have had much progress. Discussions also focus upon the following issues: (1) advantages anddisadvantages of three teaching techniques; (2)characteristics of languageproblems of these retarded children and effective strategies used in theteaching of spoken language of them; (3)the reasons why there are 3 chi-ldren who did not make much progress.

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