Based on the data of Auto Parts Firms, we model the Directed Weighted Competitive Pressure Networks and make a simulation analysis on the rivalry spread effect over this network. We discover that the higher the out weight of the initiator the heavier the rivalry spread effect over the network; meanwhile the higher the out weight edge is chose the larger the range of the rivalry spread effect. Next, we identify that the rivalry spread effect is limited within a range, although the rivalry action is initiated by different firms and different products. Further, we find that the affected ranges are tightly related to community to which the initiator belongs. Finally, we analyze the simulation result from the economic perspective.