Protecting the legitimate interests of investors and maintaining financial stability are important missions of the suitability obligation rule.Currently,while financial technology driven by data and algorithm is boosting the digital transformation of the financial ecosystem,issues such as cross-border services,convergence of user profiles,and homogenization of algorithms have raised concerns among investors about the"prohibition of profit seeking"and"best execution"of financial technology com-panies,weakening the role of the suitability obligation rule.In order to effectively address the new challenges brought by Fintech,regulatory authorities should reexamine the legitimacy basis of suitability obligations,improve the applicable standards of suitabili-ty obligation rules based on the characteristics of products and services provided by financial technology companies,clarify the specific basis of claim rights,and provide a sound legal basis to ensure"seller responsibility"and"buyer responsibility".