Today the industry cluster in developing countries comes to the bottleneck which is “big but not strong” because of excessive reliance on cost competition and lack of innovation ability. Therefore, industry cluster in space does not mean the economic competitive, the innovation network is the source of competitive advantage in the cluster. Gradually, how to promote the innovation network of industry cluster in developing countries becomes an urgent problem to explore and solve. In this paper, we review the knowledge network in the industry cluster and the weighted complex network, analyze the mechanism of cluster innovation, and at last give the tactics in order to create continuous momentum for the cluster innovation. The conclusion of this paper has some significance as reference for those policy-makers who try to improve industry cluster innovation.