Objective: This study aimed to investigate the system stability of composite sesame paste under different processing conditions. Methods: The effects of heating temperature, stirring time, cooling procedure, filling temperature, and standing curing procedure on centrifugal oil separation rate of composite sesame paste were investigated, and the oil separation days of composite sesame paste under the condition of 47 ℃ heat preservation was recorded. Results: The best technological conditions of composite sesame paste were as follows: heating temperature of 55 ℃, stirring time of 20 min, cooling and cooling at 0 ℃, filling temperature of 40 ℃, standing and curing for 24 h. The centrifugal oil extraction rate of the composite sesame paste prepared under this technological condition was significantly reduced from 6.69% to 1.78%(P<0.05), and its microstructure oil phase was evenly distributed and thereby a tight connection area was formed. Conclusion: The optimization of the process parameters of composite sesame paste can significantly improve the oil separation problem of the system. The composite sesame paste processed by this process has the best system stability.