This article takes the formula of trade complementarity index to calculate the degree of trade complementarity of various industries between China and Nordic countries based on the data of import and export from 2013 to 2018. The results indicate that the trade complementarity between China and Nordic countries has three major characteristics, that is, intensive concentration of specific complementary categories, structurally complementary in bilateral export and import and complementarity based on respective comparative advantages, and clarify the dual complementarities both in inter-industry trade and intra-industry trade. Our findings show that the basis of bilateral cooperation is stable due to strong complementarity each other. In addition, expanding the volume of trade complementary goods and cooperation are not only to promote the development of dual circulation in China, but also to reduce the segmentation costs in the processes of production for both sides.