The main structure in construction engineering is the organic part of the load - carrying system of construction engineering. Its quality is the core for realizing the value of construction engineering quality. The essence of its quality problems is that the quality behavior

intermediate output or final product of the construction body cant meet the requirements of national laws

regulations and obligatory criteria during construction work. Its quality problems have the following eight traits such as complexity

frequent occurrence

potentiality

chain effect

heavy damages

multiple responsibilities

difficulties of treatment and high expenditure for treatment.