Purpose - This paper empirically investigates the role of volatility in the China’s Renminbi (RMB) exchange rate plays on the Sino-Korea trade based on the analysis of auto industry. Due to the increasing proportion of China’s share in the world trade, RMB exchange rate is getting attention worldwide. Due to the close Sino-Korea trade relationships and the special position that auto industry plays in a country’s economy, this paper examines the causal relationship between RMB exchange rate volatility and Sino-Korea trade in this sector. Design/Methodology - Econometric methods including Johansen test of Co-integration, Granger causality analysis and multiple regression analysis are employed to explore the impact of RMB exchange rate changes on Sino-Korea bilateral trade flow using time series data of from 2001 to 2017. Findings – The outcome shows the real exchange rate changes of RMB have a limited effect on the improvement of Sino-Korea trade. The result indicates that there is a steady long-term relationship between bilateral real exchange rate of RMB and Sino-Korea trade. However, since the elasticity of exchange rate is too small, the change of exchange rate has a limited influence on Sino-Korea trade. In a short-run there is no lag on Sino-Korea trade processed by the real exchange rate. Originality/value - Neither theoretical studies nor argument analysis have reached a common conclusion on this point in the extant research. Even for the same country, the difference of industry, data and model they selected could result in the different results. Thus, this study is re-assessing the RMB’s exchange rate changes and Sino-Korea trade relationship by using the most recent and industry-level trade data. To examine the relationship this paper focuses on auto industry, the representative of the manufacturing industry in both countries.