Abstract: Since the math model of mechanized cement kiln is very complicated and difficult to establish, a fuzzy control scheme with microcomputer for a steady burning zone is proposed in this paper. The burning zone's state is systematically divided and it's definition is given in terms of fuzzy concept. In order to determine the burning zone's state, an identification method of multivariable and multigrade mixed fuzzy model is presented. Based on generalization and summation of human operatinexperience, the fuzzy control regulations of stabilizing the burning zone's state are obtained by optimization. To simplify the calculation, a simple and practical fuzzy reasoning method is put forward. By practical operating result of the control system with microcomputer,the correctness and practicability of this fuzzy control project are testified.