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.