Several dynamical models of ordinary differential equations were proposed for adjusting the prices of commodities.The models reflect the relations among the supply and demand,the service after sale and competition of prices among the same kind of commodities,and the endurability of consumers.By analyzing the models qualitatively,some conditions were obtained for the stability of the prices,periodicity of adjusting the prices and the synchronization of competing prices of the same kind of commodities.Finally,some of the models were applied to analyze the problem of Government’s macroscopical controls for the prices of commodities.Some reasonable suggestions were thus given.