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In the process of boiling sugar, human factors have a great influence on the quantity and quality of sugar. It is difficult to found accurate mathematical models of sucrose crystallization's process, which is unable to achieve precise control by traditional control method. It use Fuzzy reasoning for auto-tuning of PID controller parameters. On the basis of summarizing the classical PID control theory and the practical application of sucrose crystallization process of fuzzy control theory, which added improved PSO algorithm to optimize and adjust the process parameters for the controller. It accomplished the design of PSO Algorithm to Fuzzy Control of Sucrose Crystallization. To improve performance, what is used to control output feedback controller auto-tuning each time. Simulation test results show that by using Matlab software. This methods can enhance system robustness and improve the quality of sugar.