This paper focuses on the discussion of the sources of the difference in Chinese-Western politeness system and its reflection on the lexical form, grammatical structure, conversational structure, and linguistic and behavioral habits.

However,foreign trade English has its special language features and expressions,courtesy for one.

This article makes it clear that tourist staff should be dignified in appearance, graceful in manner, and elegant in language and from these three aspects to strengthen their courtesy cultivation and foster good professional manner.

As per business properties and ethics,business language must comply with the 3"C" principles: clearness,conciseness,courtesy.

Investigation and analysis of politeness in intercultural daily speech communication;

Application of Politeness Principle in English Class Teaching;

On Politeness Translating Between Different Culture Communication;

Thanking as a convivial speech act is polite in essence.

It is extremely necessary to analyze the violation of cooperative principle for the purposes of being polite,humorous and ironic.

According to studies on the transmission and transformation of material and energy, and the feedback mechanism, the slope disintegration erosion landform system was built.

From the perspective of construction level,several aspectual systems are criticized in this paper,which are then compared with a four-level Chinese aspectual system.