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The purpose of this study is to clarify the evaluation of CO concentration in underground parking based on CFD. The air ventilation is effected by temperature, atmosphere speed and concentration. So, this paper deal with method of installing the jet fan and it is prepared with same average temperature, atmosphere speed and concentration of outdoor CO. After simulating, we can check average concentration of CO in underground parking lot. From the test result, Just Case 2, it is only satisfied with legal standards at almost of the parts except for side of the underground parking lot. In our opinion, if we check some parts which is over the legal standards at the area before constructing a parking lot, we will be able to save energy, cost.