Abstract: Based on the theories and empirical research results of export competitiveness of high technology (high-tech) products, this paper employs ESI(Essential Science Indicators) to analyze the complementation and competition of high-tech products of BRICS' countries in international trade market, especially when export to OECD countries. This paper also uses the RCA Index (Revealed Comparative Advantage Index) to compare the competitiveness of high-tech products between BRICS countries. Panel data will also be used in comparing BRICS' export competitiveness factors of high-tech products. This paper aims to explore the competitive advantages of BRICS countries' high-tech products in international trade and give constructive suggestions to improve the export volume of high-tech products of China.