Statistics in Collocation Extraction and Computer Implementation;

Analysis and Comparison about the Approaches of Collocation Retrieval Based on Statistical Model;

Collocation is classified into lexical collocation and grammatical collocation,which is the indicator of nativeness and complexity respectively.

The habitual word combinations in English and Chinese are either restricted or affected by the characteristics of the two languages and their respective cultures.

On the basis of research,the negative effect of native language can influence learners\'English collocation learning in three aspects: the negative effect of native language can make learners commit grammatic errors,semantic errors and pragmatical errors.