The knowledge model of SMEs internationalization growth includes gradual model, knowledge-based model and network model. Three stages of acquiring knowledge on SMEs internationalization growth in a cluster will include external learning of leading international enterprises in cluster, learning from each other between SMEs and leading international enterprises in cluster, collective learning for enterprises in cluster. This research shows SMEs internationalization growth is generally featured by gradual advancement and the cluster has an advantage of network in knowledge-learning. The interactive mechanism between agents of cluster network in SME internationalization growth and the network of international relation is the mechanism to learn, accumulate and spread knowledge within and outside the cluster.