This paper observes some divergences associated with semantic syntactic mapping across Chinese and English from lexical semantic viewpoint. And further analysis of the validity and reasonability of mapping operations in semantic syntactic mapping is given. Divergence mapping sets, divergence indicators and parameter uniform mechanism are provided to resolve the machine translation divergences. The application of the divergence processing mechanism with divergence indicators improves the accurateness of machine translation,and makes the target-language sentence natural and perfect.