By the questionaire for investigation, we have analysed statistically navigators collision avoidance behaviour and obtained some valuable data for reference.

Governed by the social norms,written inquires with different ritual linguistic patterns and lexis express the Chinese writer s perception of the relation with the recipient and his/her determination in maintaining social contact and appropriate interaction between each other.

In order to solve the problem of difficult bus query by the external passengers,the paper uses pattern matching,calculation of edit distance,semantic computation and the technology of automatic QA(question answering)to implement a mobile bus query system based on the natural language QA.