In order to get the human error probability of the launching base precisely, taken safety evaluation of launching base as background, based on the cognitive reliability and error analysis method (CREAM), the launching base human reliability analysis (HRA) was studied in quantify. Firstly, the common performance condition (CPC) is improved in consideration of the launching base. Secondly, the mapping relation from CPC to control model is disposed using a fuzzy method, then the conception of condition effect factor and the HRA flow process of launching base are proposed. Finally, the process of the rocket lifting is analysis as an example. The results show this method can calculates the human error probability of launching base precisely, and also provides theoretical basis and reference for human safety analysis of launching base.