| The emergence of pretend play has a far-reaching impact on the development of children in many fields,and at the same time shows that the individual’s representational ability has made a great leap.However,the performance of children with autistic in the field of pretend play has very significant problems.Researchers have paid more attention to motivating children to achieve better generalization and maintenance effects in the research of children with autistic.The application of motivational operation principle in the intervention of children with autism is more and more popular.As a result,this study focuses on children with autism and their object subsitution skills and aims to use the principle of establishing operation to enhance the richness of children’s object substitution behaviors by the teaching of natural situation topics.This study uses the cross-behavior multi-detection design in a single subject study,and use natural contextual pedagogy,support and reinforcement strategies as a method to enhance motivational operation,to explore the effect of the principle of motivational operation in the intervention of object subsitution of children with autistic.The natural context themes used in the research include food,hygiene and the wild.The results of the study showed that through intervention,the two children with autism showed a significant increase in the number of correct object subsitution behaviors in these three themed pretend games and can be maintained for a long time;the children’s acquired play skills can be generalized,they can also interact actively with family members in pretend games in daily situations. |