Under the background of the development of global economic integrations complex tea trade network relationship was established between countries around the world. Based on the complex network analysis method, this paper dynamically analyzed the global tea trade network from 1987 to 2019, mainly explored the structural characteristics of the network system, the changes of core nodes and trade lines and the pattern evolution of China's tea export market in order to better respond to changes of the global tea trade network and provide a useful reference for promoting China's tea trade. It is found as follows. 1) The global tea production and trade volume was growing steadily, and the trade network was increasingly close, but the international tea trade competition was more intense. 2) Countries including Kenya, China, Sri Lanka, India, Indonesia, Argentina and Malawi are the major tea export countries in the world, countries including the United Kingdom, Russia, Pakistan, the United States, Egypt, Iran and UAE are the world's major tea importers, a number of countries like the United Kingdom, the United States, France and China are important transfer stations of global tea trade and the United States has become the largest transfer station. In addition, countries that have a tea production base to support exports are still at the lower end of the global tea trade value chain, while countries that rely on imports to transform exports, that is, countries with a high degree of betweenness centrality, have a stronger ability for tea deep processing and value promoting. 3) The average value of global tea trade on core trade lines continues to rise, but the overall proportion has declined, which doesn't show the phenomenon of "club convergence", and there is a relatively stable relationship of output and input between the two countries on the major trade lines of tea. 4) The overall performance of China s tea export trade is getting better, the order of the export proportion from high to low is Africa, Asia, Europe, America, Oceania. China's tea export market presents a multi-point scattered and partially concentrated distribution pattern, the export market has shrunk in Western Europe, East Asia, North America and other countries, and it has expanded in North Africa and West African coastal countries. There is an evolutionary trend of "multiple small markets accompany a supermarket", among them, Morocco is the absolute largest market for China s tea exports. [ABSTRACT FROM AUTHOR]