How China Merchants Bank Achieved Full Cloud Migration: Strategies and Lessons

Rapid Growth of China’s Financial Cloud Market

Amid the fast‑moving digital economy, China’s financial‑cloud market reached 39.4 billion CNY in 2021 and is projected to grow at a 28.6% compound annual rate, potentially surpassing 1 trillion CNY by 2025.

China Merchants Bank Leads Full‑Cloud Adoption

China Merchants Bank (CMB) became the first among the top seven system‑important banks in China to achieve complete cloud migration, moving debit‑card accounts, credit‑card customers, corporate accounts and all application systems to its private cloud. By rebuilding its account and application architecture, the bank now enjoys a platform availability of 99.999%.

Interview Insights from CIO Jiang Chaoyang

In a interview with China Banking & Insurance News, CIO Jiang Chaoyang explained why full‑cloud migration is essential, how CMB accomplished a seamless transition, and what the post‑migration era will focus on.

National Policy Driving Financial Digital Transformation

The State Council’s “14th Five‑Year” Digital Economy Development Plan (January 2022) listed accelerating digital transformation in the financial sector as a priority, aiming to improve management systems, service models, and overall industry efficiency.

Cloud as the Core of CMB’s Digital Strategy

Jiang highlighted that cloud’s openness, shared culture, agility, and flat architecture align with CMB’s technology goals, prompting the bank to reconstruct its tech stack on an advanced private‑cloud platform.

Two‑Phase Cloud Transformation Roadmap

Phase 1 (2015‑2019) focused on building a private‑cloud platform capable of hosting key applications. Phase 2, launched in early 2020, set a three‑year target to migrate the entire technology ecosystem to the cloud.

Key Milestones of the Full‑Cloud Project

2020: Host migration began; by December, core accounting functions were deployed on the new financial‑transaction cloud. 2022: Debit‑card data (June 24), credit‑card data (September 7), corporate business (December 5) and host systems were fully migrated.

Open‑System Cloud Migration

Starting in May 2019, CMB moved its open‑platform systems to the cloud, completing mobile‑banking cloud (September 22 2022), branch‑level systems (September 27 2022) and head‑office systems (September 29 2022).

Scale and Complexity

The migration covered over 2,220 systems, utilizing 200,000 containers, 100,000 virtual machines, 16 PB of data, and handling roughly 300 billion transaction requests daily.

Ensuring Seamless, Zero‑Impact Migration

More than 3,000 technology staff and 400 business staff organized the effort into 30+ work packages, completing over 6,000 deployments across 3,500 projects with 100% self‑development, zero major incidents, and 99.999% service continuity.

Data Security and Compliance

Protecting massive data and customer privacy is a prerequisite, addressed through strict software‑engineering processes, gray‑release strategies, and a “follow‑account” mechanism that validates accounting results by running parallel transactions on old and new systems.

Advanced Monitoring and Incident Handling

CMB built a comprehensive monitoring system named “Beidou,” which records traces across all processing modules, enabling precise fault isolation and rapid response during cloud incidents.

Strategic Value of Cloud

Cloud serves as a foundational tool that boosts development efficiency, elasticity, and cost‑effectiveness, supporting CMB’s “five‑transformations” (online, data‑driven, intelligent, platform‑based, ecosystem). Post‑migration, the bank aims to strengthen technology capabilities for investment banking and asset‑management businesses.

Upcoming GOPS Global Operations Conference

The 20th GOPS Global Operations Conference (April 7‑8 2023, Shenzhen) will feature CMB experts presenting their cloud‑migration practice and insights.