This article focuses on the internal and external changes faced by financial institutions in digital transformation，and the difficulties in business，data，technology，operation，organization，and talent. This article deeply analyzes the origin，positioning and value of promoting digital transformation. According to the FinTech Development Plan（2022-2025），this article proposes the overall framework，capability system and practical cases for the integrated operation of the middle platform. Based on practice，this article focuses on analyzing the key success factors in the process of building an integrated operation of the middle platform，including organizational guarantee，incentive mechanism，talent team building，and innovation of operating models，etc.，to provide a reference for accelerating the digital transformation of financial institutions and achieving high-quality development.