The paper examines the influence of individual preference heterogeneity to the voluntary supply of public goods under the analysis of one-shot and simultaneous-move games.Based on the model of logarithmic Cobb-Douglas form utility function,in which the parameter of reflecting the degree of preference(preference difference)was enacted,the paper analyzes individual optimal decision-making and preference heterogeneity effect under the equilibrium for the gross income missed and obtained the level of least contribution.The research result shows that the influence of differences in individual preference difference to the provision of public goods is relied on the comparison between members' income budget expense and the fixed cost of public goods,the common parlance of "U" type curve is improper.