This paper mainly analyzes the main factors influencing South Korea's FDI to China from two aspects: South Korea and China. The analysis shows that China's GDP growth has a negative impact on FDI from South Korea, while South Korea's GDP growth has a huge positive impact on FDI to China. South Korea's exports to China play a positive role in promoting FDI to China, while China's exports to the world also drive South Korea's FDI to China. As can be seen from the interest observation variable PPI cited, the increase of PPI has a negative impact on FDI from South Korea to China, especially on small and medium-sized enterprises. The exchange rate change has a much more significant impact on large enterprises than on small and medium-sized enterprises, but the impact is not high compared with other variables. The depreciation of the Korean currency against the RMB will be detrimental to South Korea's FDI to China.