Abstract: A fuzzy risk-based(Fuzzy RB) strategy is proposed to achieve more flexible and efficient resource allocation in dynamic computational grids.First,the framework of grid resource allocation based on continuous double auction(CDA) is discussed.Then,the risk-based strategy is analyzed and combined with fuzzy theory,and the Fuzzy RB strategy is proposed. The experiment results show that the Fuzzy RB strategy is better than other strategies and can achieve higher efficiency in dynamic grid;the market efficiency is over 99%and the transaction price can quickly converge to the equilibrium price.