Abstract：
With the extension of valuation method of bill of quantities, prime cost item is increased. After analyze bidding risks for prime cost item, the bid risk index system is built. By using fuzzy set theory, the fuzzy set and membership functions of risk evaluation for prime cost item are built. The membership function is analyzed by the “most close degree principle”. Then the risk grade of each risk factor is determined. Next the above model is verified by samples. The results show that: the “honest administration risk” is the key factor(degree), the others are “pricing risk” and “cost controlling risk” (degree), “project quality and safety risk” (degree), “bidding together organization risk” (Ⅴdegree). In the end, the corresponding countermeasures for bid of prime cost item are put forwarded.
