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Electrostatic precipitator is a kind of important dust collecting equipment. The rapping acceleration is the standard of electrostatic precipitator design and manufacturing. The aim of the work reported in this paper was find a new method for solving the rapping acceleration. Based on the numerical analytical method and the dynamic display algorithm, this paper is to build a new method for solving the rapping acceleration of electrostatic precipitator by using finite element method. By comparing the results of finite element method and the model test data and analyzing calculation results, this method is proved to be correct and effective. Using this method in the analyzing of practical equipment, the result basically tallies with the actual result. The finite element method can be used conveniently in different plate profiles, different ways of hanging, striking hammers and different methods of rapping. So the finite element method has an important practical significance in the analyzing of existing plate and the researching of new plate.