Tea is one of the major cash crops of Yunnan province. It damaged by the thrips infestation that causes minor to severe losses. The present study proposed to check the diversity index of thrips and their seasonal activity. The experiments were carried out at the Tea Research Institute of Yunnan Academy of Agricultural Science Farm located in Xishuangbanna, from October 2018 to the January 2019. Three tea cultivars Camellia sinensis var.assamica cv Yunkang No.10 (CY), Camellia sinensis var.assamica cv Changye baihao (CC), and Camellia sinensis var.assamica cv Zijuan (CZ) were used in the study. The three tea cultivars were grown within the same agricultural conditions. A total of 21957 thrips adults specimens belonging to 8 species (Lefroyothrips lefroyi, Thrips hawaiiensis, Thrips anderwsi, Thrips flavus, Ernothrips lobatus, Megalurothrips usitatus, Dendrothrips minowai, and Haplothrips tenuipennis) representing 5 genera were collected by a weekly survey. The results showed that the predominant species were L. lefroyi and T. hawaiiensis with a relative abundance of 89.36% and 6.37%, respectively with an increase in population abundance from December to January. The CC tea cultivar showed high thrips diversity (Simpson 1-D=0.1583), Dominance D=0.8417, Evenness (E=0.2057) and diversity richness (Shannon H=0.3645). However, CY showed the highest diversity richness (Shannon H=0.5151) and the lowest abundance index (Simpson 1-D=0.2983) with an evenness of (E=0.2391). This information is not only useful for agricultural purposes; it will also give an insight into the insect species richness of tea varieties which is critical information to the tea production system, pest management, and conservation purposes.