The main characteristic of risk investment is high risk and high income. Therefore, the risk scale and the constitution of risk investment project become important factors when the risk investors make the risk investment decision. In Chinese researches about risk investment decision- making theories, the comprehensive evaluation of risk of the venture investment project mainly is quantitative method. Although the quantitative method has been used from time to time, it does not have big applicability. Aiming at above circumstances, this paper firstly analyses risks that exist in venture investment, then establishes the system of risk evaluation index. Lastly, the paper objectively assesses risks in venture investment through analytic hierarchy process model and fuzzy comprehensive evaluation model, offering concrete and viable basis for venture investment decision-making.