A model of "construction quality assessment space" is designed in this paper,which illustrates construction quality assessment in three aspects as construction types,phases and characteristics.Based on this model,the construction quality assessment system(CQAS) is structured.As a part,the construction quality index(CQI) can be used for evaluating the Chinese construction quality status;and some technical methods such as spot checks and analytic hierarchy process can be used for getting macro and micro construction quality assessment results.