Abstract: In recent years, cloud model evaluation methods has been deeply applied in slope stability evaluation. However, the current evaluation index weight was a precise value, which has not take uncertainty and ambiguity of the index weight into consideration. In order to solve this problem, the paper tried to using the index variable weight cloud model, and introduced the weight range coefficient to adjust the change range of the index. The evaluation indexes were selected by referring to "Technical Regulations for Hydropower and Water Conservancy Slope Engineering Geological Survey" and "Technical Requirements for Geological Hazard Survey". With reference to industry standards, the research experience of scholars and the actual situation in Fujian Province, the equidistant method was used to divide the stable grading intervals of each evaluation index. According to the above method, the algorithm was developed in the MATLAB program. The compound cloud model based on the variable weight of the index and the corresponding application program were developed. Based on the analysis of the slope of Huangqi Town, Lianjiang County, Fujian Province, it was believed that the slope was generally stable, but there still has the possibility of turning into instability. According to the survey report, the slope section collapsed due to heavy rainfall on June 17, 2016, which preliminarily verified the analysis results of this method.