A new method is put forward to evaluate projects of bracing system for deep excavation to avert uncertainty and random caused by subjective estimation. Weight coefficients of indices are determined by entropy weight method
which combines subjective estimation with objective facts
combines qualitative analysis with quantitative analysis. At the same time
TOPSIS method is associated with entropy weight method to make a rational evaluation. This method has been applied to real project of bracing system for deep excavation; and the result is approvable.