Abstract: According to the analysis of the implicit parallelism in algorithms, a physical model of implicit parallelism in algorithm is proposed. The uncertainty and high entropy state of algorithm bring forward implicit parallelism, but the implicit parallelism of algorithms may cause the uncertainty of algorithm results. In the proposed model, the search direction in result space is decided by the apriori knowledge and the high speed parallel search ability is decided by the implicit parallelism. The implicit parallelism of genetic algorithm and simulated annealing algorithm are analyzed by this model.