This paper examines the regional tax coordination issues faced by member countries of theRegional Comprehensive Economic Partnership ( RCEP) in the context of high-quality development from theperspective of tax policy coordination, using comparative analysis and case study methods. "The article systematically reviews the background, objectives, and potential impacts of the RCEP agreement on member countriestax policies. lt also conducts a horizontal comparison of the tax systems of the 15 member countries to identifpotential risks arising from tax system differences , such as base erosion, tax competition, and conflicts of taxjurisdictions. The study reveals numerous challenges in current RCEp tax coordination practices , including theinequity of tax preferential policies , the lack of tax information sharing mechanisms, and insulicient tax admin.istration cooperation. It also proposes suggestions on how to optimize tax coordination policies among RCEPmember countries. Member countries of the RCEP need to conduct deeper-level coordination in tax policiesreach a broader consensus, and build a more effective framework for tax cooperation in order to reduce tax conficts, optimize the regional tax environment, and promote balanced and sustainable economic developmentThis study not only provides theoretical support for regional tax coordination under the RCEp but also offersdecision-making references for policymakers in practice. lt emphasizes the core role of tax policy in promotingregional economic integration and high-quality development and highlights the importance of strengtheninginternational tax cooperation and building a fair and reasonable interational tax order. The study holds significant academic and practical value.