Abstract:The current method for the multi-factor cost control of post-earthquake reconstruction projects has low control accuracy because it ignores the deviation caused by the factors that affect project cost. Therefore, the multi-factor model based on the gray model for the cost control of post-earthquake reconstruction projects is necessary. In reference to the factors that affect the cost of reconstruction projects, we analyze the schedule deviation caused by the absence of management procedures for post-earthquake reconstruction projects, the quality deviation caused by the influence of design capability, and the price deviation caused by the instability of supply and demand in the construction materials market. In addition, we calculate the deviation coefficients caused by various factors and obtain results for the overall deviation of reconstruction projects with increased accuracy. The cost control constraint function is constructed and used in combination with the gray model, and the multi-factor cost control model of the post-earthquake reconstruction project is then established. Experimental results show that the model has high accuracy, low deviation from the actual value, and high credibility. The model can reduce project costs when used in the omnidirectional dynamic management of reconstruction projects.