Abstract: With the wide application of Unmanned Aerial Vehicle(UAV), the reliability of UAV has received increasing attention. Currently, related research mainly focuses on the optimal design and the reliability of the whole system, studies on human reliability of UAV operators have rarely been reported. According of the features of the UAV system, the CPC factor set of UAV operators is established by CREAM method, and the contribution of CPCs is determined by rank correlation analysis. Using improved CREAM method, continuous function between CPC factors and control modes is constructed. The case results show that the improved method is more scientific and reasonable, and it has certain guiding significance for the human reliability of UAV operators.