Temperature stability has an important influence on the quality of Low Pressure Injection process. A fuzzy PID algorithm is proposed to improve the temperature control strategy. This method can further improve the control precision of the existing low pressure injection molding equipment.This paper introduces the mathematical model and system dynamic parameter setting idea,also describes the testing circuit and the software algorithm used in this study. Finally, the temperature control experiment shows that the temperature control system designed in this paper can automatically adjust the relevant parameters in different environments, and achieve the accuracy index of ±0.5℃.