How GRCUB rebuilt its core banking system in 520 days

Summary: Guizhou Rural Commercial United Bank launched China's first provincial-level rural core banking system on full-stack technology. After 520 days, 64 systems were migrated in 22 hours—boosting transaction processing and batch efficiency with an active-active data center architecture. The two partners also released a "Core System Transformation Practice Template", offering a replicable blueprint for regional banks to accelerate their digital transformation.

(Sept 2026) Guizhou Rural Commercial United Bank (GRCUB) provides essential financial services to farmers, rural entrepreneurs, and SMEs across a geographically diverse region. Its legacy core system, however, suffered from slow batch processing and rigid infrastructure. That made it hard for the bank to tailor products to agricultural cycles and raised concerns about business continuity.

To overcome these constraints, GRCUB worked with Huawei to replace the legacy system with a cloud-native core platform designed to scale more easily, support faster product development, and keep critical services running during disruptions. The modernization program was organized around six engineering workstreams.

Guizhou Rural Commercial United Bank

From design to launch in 520 days

From design to production, the project was completed in 520 days. During the final 22-hour switchover, 64 critical business systems—including core banking, payments, lending, and customer management—were migrated to the new platform. This was accomplished with zero data loss and minimal disruption to customers.

Reliability was engineered into the transformation. The platform runs simultaneously at two data centers in different cities, so services can continue if either site fails.

A cloud-native foundation designed for scale

The new core is built on a full technology stack spanning hardware, software, and networking. Its cloud-native architecture allows computing capacity to be scaled according to demand, while IPv6-native interfaces support more flexible connectivity. NoF+ high-speed storage networking improves the movement of data between computing and storage systems.

Together, these technologies improve business continuity and reduce reliance on external technologies.

Measurable improvements in performance and resilience

Since going live, the new system has delivered clear operational gains:

• Faster product launches. Seasonal agricultural loans and micro-enterprise credit can now be launched in days rather than months, directly supporting rural revitalization.
• More efficient processing. Online transaction handling, batch processing, and core response times have all improved, allowing the bank to manage periods of peak demand more smoothly.
• Greater resilience. The two data centers can support each other, reducing the risk of downtime and helping critical services remain available if one site fails.

These improvements allow GRCUB to serve rural customers more precisely and contribute more effectively to the local digital economy.

Creating a template other banks can use

GRCUB and Huawei codified the engineering approach used on the project—including design standards, testing scripts, and switchover procedures—in a structured “Core System Transformation Practice Template.” They also established a demonstration site showing how the full technology stack works in practice.

Together, these resources provide provincial rural commercial banks and mid-sized lenders with a practical reference for their own modernization projects. The experience demonstrates that banks with limited in-house cloud expertise can still implement and operate an independently controlled core system.

Joint innovation and broader industry impact

Building on the project, GRCUB and Huawei have established a joint innovation lab to explore the use of AI in operations and fraud detection, as well as green computing. They also plan to apply the template-based approach to data warehouses, mobile banking, and open API gateways.

For Huawei, the project demonstrates a role extending beyond infrastructure provision to include engineering frameworks and automation tools.

By the end of June 2026, Huawei had served over 7,100 financial customers in more than 80 countries and regions, including 54 of the world's top 100 banks, and continues to support core modernization projects at scale. Huawei has also established strategic partnerships with more than 80 large banks, insurers, and securities companies across the globe, becoming their trusted partner in digital transformation.