THAAD has been issued seriously for a couple of years. This study is focused on analyzing the impact of THAAD deployment on the management performance of tourism industry in Korea and suggest the effective ways to handle it. To accomplish the study purpose, we analyzed the differences of management performance of hotels, travel agencies and casinos before and after THAAD deployment in Korea. As the result of analysis, there were significant differences in the variables of profit margin ratio before income taxes and operating profit ratio as a profit index, in the variable of debt to equity ratio as a stability index and in the variable of total asset turnover ratio as an activity index before and after THAAD deployment in Korea in the case of hotel firms. And also there were significant differences in the variable of increased total asset ratio as a growth index, in the variable of dept to equity ratio as a stability index and in the variable of total assets turnover ratio as an activity index before and after THAAD deployment in Korea in the case of travel agencies. Lastly there was a significant difference in the variable of total asset turnover ratio as an activity index before and after THAAD deployment in Korea in the case of casinos. Therefore the managers should find an effective way to overcome the difficulties occurred by the political conflict to improve the management performance.