In order to analyze the risk-benefit assessment for greenhouse investment, risk-benefit assessment index system for greenhouse investment was established, and the weight of the factors was determined by using revised analytic hierarchy process. The riskbenefit assessment model of greenhouse investment was established based on D-S evidence theory. Expert system for risk-benefit assessment of greenhouse investment was developed. By means of the expert system, each expert can give the assessment for every program, and then the system assesses the risk-benefit comprehensively according to the ideas of each expert. The result can provide the basis for the investors to choose the proper greenhouse structure.