Based on redefining the concept of technological convergence, this paper analyzes market demand of convergent products according to the characteristics of technological convergence in IT industry. We define market power as the function of product price and the improvement of convergent product's performance. We also assume the original technology is symbiotic. Based on the above analysis, the paper modifies the Bass Model and the hypotheses of related models, builds a demand growth model of

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... nological convergent products, and uses this model to analyze and estimate the demand growing of converged products. At last, we discuss the conditions that technological convergence will be successful.