According to the theory of yielding supporting,the authors introduces the combination of the half-circle bamboo lagging and steel trapezium-shaped support together with welding antiskid device at the structure of steel trapeziumshaped booth beam and lag winch's joining section,which optimizes the structure of the steel trapezium-shaped support.

According to the principle of "integrated planning,special personnel in charge,scientific management, sharing risks" and using the rationale of "trapezoid framework",a suggestion for constructing an integrated risk management system is proposed,and its feasibility is analysed.