The purpose of this study is first, to identify the causality between the demand of Vietnamese tourists visiting Korea and the Korean-Vietnam trade; second, to empirically analyze and predict the long-run and short-run dynamic effects of the two. Estimates of the VECM showed that the long-run elasticity of the Korean-Vietnam trade and the demand of Vietnamese Tourists visiting Korea was 1.289. As a result of the analysis of the Impulse Response Function, the trade shock between Korea and Vietnam had a positive effect on the demand of Vietnamese Tourists visiting Korea from two months. And the impact of the demand of Vietnamese Tourists visiting Korea had a positive effect on the trade for the first two months, but not much in the long run. As a result of Forecast Error Variance Decomposition, it is estimated that if the trade between Korea and Vietnam changes, the effect on the demand for tourists from Vietnam will gradually increase.