Abstract: Opening-up at a high level is the only way to enhance China's competitiveness in service trade. Based on the text of China's Regional Service Trade Agreement, this paper constructs an industry-level market access index to solve the problem of measurement bias caused by the lack of differentiation of industry opening differences in previous studies.Then the paper uses the trade data of OECD-TIVA database to examine the impact of market access and the depth of agreement on bilateral service trade between China and its trading partners. The results show that market access and the depth of agreement have positive effects on service trade. In terms of heterogeneity, the phased effect of RTAs gradually emerged and then weakened, significantly promoting China's service trade imports to developed economies and China's service trade exports to developing economies, and playing a more significant role in promoting industries with a significantly improved level of openness.

Key words: regional service trade agreement, depth of regional service trade agreement, service trade restriction index, market access