The clogging problem of the zeolite rotor is a difficult problem in the paint shop. It may reduce the efficiency and increase VOC emissions. When it is worse, it may even cause serious consequences such as equipment shutdown and burnt. Based on the actual situation of A company, the particle size of the paint exhaust gas was analyzed, using microscopes, thermo gravimetric analysis, Py-GCMS analysis and other tools to determine the clogging reason. After cleaning by brush and compressed air, the clogged rotor restored. By comparing the bag filter and cassette filter, the suitable filter was determined. After equipment modification,the rotor can maintain efficient and stable operation in a long term.