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This study investigates the heat and mass transfer performance of the dehumidification system under periodic change of environmental pressure by simulation.Based on some available literatures,in order to enhance the performance of the system,the environmental pressure should be higher during adsorption and lower during regeneration.In this study,investigations of the optimal period to optimize the performance of this system is figured out.To verify our simulation,the simulation result in this study is compared with the experimental test results,and it is found that the trend of simulation result correspond with the experimental data.In this study we compare the results of different air flow rate during adsorption process and different heating distribution during regeneration.