Considering the buy-back cost of the supply chain,a new composite strategy has been put forward in this paper,com- bining organically the buy-back strategy with the dead stock premium strategy,and it has been proved that the expected profit of the composite strategy system is greater of equivalent to that of the buy-back strategy or of the dead stock premium strategy.

Taking into account the dynamic matters of the congested vertices,we introduce the three strategies of the greedy strategy,reposition strategy and waiting strategy respectivly,systematica.

We introduce two on-line scheduling strategies,such as greedy strategy,reposition strategy,analyze the advantages and disadvantages of competitive performance of two strategies,and then present the comparison strategy and the algorithmica model.

Let the combination of penalty function method and renovation strategy be applied to the optimal genetic algorithm with nonlinear constraint,thus let the constrained optimal problem be converged in an overall optimization under the coordinative effect of penalty function and renovation operator.