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Diffusion of technology innovation is the dissemination of the technology innovation among the potential users by some means. Since the effect of technology innovation to productivity depends on the speed and range of its diffusion, the diffusion of technology innovation is an important component of technology innovation theory. In this paper, it is proved that the basic S-type diffusion function is symmetric about its inflection point, and some discussion is made on Fishes-prr model. Furthermore, the single investment risk evaluation method and comparison and selection method of investment scheme in modern risk measurement methods are employed to high-tech investment, and some instances are illustrated to analyze the risk measure of the high-tech innovation projects. This is of much value for risk investment decision-making.