Through the marketing research we can have an exact recognization on the real conditions of Chaotianmen market: It is mainly a free system market and the secondary wholesale market now, and chief customers are the people with low or middle income in urban or rural areas.

Comparative research into the difference between Yiwu Market and Chaotianmen Market of Chongqing;

Current management mode of Caotianmen market is to set up the stag e to let businessmen develop, whose essence is to implement market management.

Application of HP-400 Polycarboxylate Admixture in ChaoTianMen Bridge;

The data of current capacity and ammonia nitrogen density of Chaotianmen cross section from 2006 to 2007 were grouped according to the flood season and the non-flood season,then the Spss software was used to make the analysis of the two groups of data to draw the conclusion.