The triangular fuzzy number was introduced into the calculation of the network planning,then the fuzzy early time was calculated by the theorem of triangular fuzzy number addition,the fuzzy late time and float time were calculated by the Minkowski subtraction.The fuzzy linear programming calculation model is proposed by fuzzy distribution theory and linear programming theory to overcome the non-frivolous issues,such as the negative number of fuzzy,the no-convened fuzzy distribution.By comparing the model based on hierarchical linear programming and the correction theory,the calculation results of the theory model show that the float time of fuzzy is positive,the fuzzy distribution is convened and the computation is smaller.