Abstract:According to the in-depth analysis of the essence of the Science and Technology (S&T) service industry’s agglomeration development, this paper puts forward that the S&T service industry agglomeration area is actually a sub network of collaborative innovation ecological network. Based on the impact perspective of collaborative innovation ecological network and combined with the analysis of existing literature, this paper extracts the factors influencing the agglomeration development of S&T service industry from three dimensions of government, external environment and internal environment, adds the influencing factors of innovation network, and uses intuitionistic fuzzy analytic hierarchy process to determine the weight of all influencing factor. Taking typical city (Xi'an) as an example, the importance ranking of the factors affecting the agglomeration development of S&T service industry is obtained, in which the macro policy environment is the most important factor, followed by the S&T innovation ability of regional Industry-University-Research (IUR) collaborative innovation network and the collaborative ability of S&T service intermediary. Finally, it puts forward some policy suggestions to promote the agglomeration development of S&T service industry, such as improving the government support policy, improving the S&T innovation ability of regional IUR collaborative innovation network, and establishing high-end S&T service cluster area, so as to provide reference for the specialization development of S&T service industry and the agglomeration development of S&T innovation industry chain for China's cities.