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The improved control algorithm in central air conditioning control system is discussed in this paper. Based on a number of practical projects, a primary theory model of expert fuzzy logic controller is established. The expert control ideal is applied in the framework design process of the air conditioning control system. The boundaries of membership function are decided by expert experience, and the flexible control rule set is designed. The realization of the core algorithm depends on parameters adjustable fuzzy-PD algorithm to ensure the control precision and the flexibility. The detailed design steps and key design result are given. The MATLAB simulation result proves the design is reasonable and can be applied in practical projects. The design thinking in this paper is new and can help engineers improve their control strategy in their practical works.