Making full use of remaining resources, the enterprises form a correlation between the different products. There must be an intrinsic link about a group of scope economy products which are brought by the enterprise. Technology is one of the most important factors of production, which is a vital form of expression to create scope economy for enterprises through technical association of products. There are four forms of scope products, that is, local independent association, local cross-correlation, technology overall relevance and technical mixed association. To create scope economy, large scale of technology, specialization of labor and efficiency of equipment are the inner mechanism of technology association. Enterprises should fully consider their own industry characteristics and management stage during the implementation of diversification strategy, adopt appropriate technical association methods and create scope economy sufficiently.