TL;DR

Azure China, operated by 21Vianet, is a physically separate instance of Microsoft's Azure cloud, run independently under Chinese regulation rather than by Microsoft directly. That structure exists because of China's telecom licensing requirements, and it means separate accounts, separate billing, and a real, though narrowing, feature gap compared with Azure Global.

Azure China doesn't solve third-party resource compatibility, which sits at a different layer entirely and is where most China web performance problems actually come from.

What is Azure China?

Azure China is a physically separate instance of Azure, operated by Shanghai Blue Cloud Technology Co., Ltd., known as 21Vianet, a subsidiary of VNET Group. Microsoft licenses the underlying technology to 21Vianet, but Microsoft doesn't operate the service directly.

It's built on the same core Azure technology as the global service, but it's a distinct environment, not simply another region inside global Azure.

Why Azure China is structured this way

China's telecom regulations require cloud IaaS and PaaS providers to hold value-added telecom permits, generally limited to locally registered entities with restricted foreign ownership. This is the same regulatory logic behind ICP more broadly, which applies to any website hosted in China.

It also connects to data requirements under China's Cybersecurity Law, Data Security Law, and Personal Information Protection Law. 

Under these laws, certain data collected and generated in China must be stored within China by default, and cross-border transfer is only permitted after passing a security assessment organized by the Cyberspace Administration of China, in specific circumstances such as handling personal information at scale or data classified as "important data." 

Operating through a licensed local entity like 21Vianet is how Microsoft meets that requirement for Azure China specifically.

Read more about Personal Information Protection Law

Azure vs Azure China

For a team evaluating or already running on Azure China, the practical differences are worth being specific about.

Azure China uses separate accounts, billing systems, a separate management portal, and separate credentials from Azure Global. There's no shared login between the two, and an existing Azure Global account can't be used to access Azure China.

Signing up generally requires a Chinese business license, an ICP,  PBS, real name verification for online service users. Companies without one typically work through a local partner or managed service provider to deploy on Azure China instead. 

A real feature availability gap exists compared with Azure Global, though it has been narrowing over time. 

You may refer to the Azure vs Azure China checklist here.

What using Azure China does, and what it doesn't

Azure China solves onshore hosting, data residency compliance, and reduced latency for infrastructure that's actually located in China. For teams that need data to stay in-country for regulatory reasons, this is a real and often necessary piece of the puzzle.

What Azure China doesn't solve is third-party resource compatibility.

A site hosted on Azure China can still depend on fonts, analytics scripts, embedded widgets, or plugins that are blocked or slow when requested from inside China, regardless of where the underlying hosting sits. 

That's an application-layer issue, distinct from infrastructure, and moving the hosting onshore doesn't touch it. 

The same distinction shows up with websites using a CDN in their existing stack. Read more on "Why Is My Website Slow in China?"

How to use Chinafy with Azure (or Azure China)

Chinafy is an official cloud partner alongside AWS, Azure, Alibaba Cloud, and Google Cloud, built to work alongside an Azure China deployment rather than replace it.

Chinafy identifies and resolves the third-party resource issues that persist regardless of hosting location, layering optimization on top of whatever infrastructure decision a team has already made. No rebuild, no rehost, no change to the Azure China setup itself.

Get started with Chinafy

FAQ

Can I use my existing Azure Global stack in China?

No. Azure China uses separate accounts, billing, and credentials from Azure Global, with no shared login between the two.

Do I need a Chinese business license to use Azure China?

Generally, yes. Companies without one typically work through a local partner or managed service provider to deploy on Azure China instead.

Does hosting on Azure China mean my site is fully optimized for China?

No. Azure China addresses infrastructure and data residency, not third-party resource compatibility. A site can be fully hosted onshore and still have blocked or slow resources at the application layer. See [Why Your CDN Doesn't Solve Your China Problem](#) for the related distinction between delivery and compatibility.

Is Azure China the right solution for me?

If a site is already hosted on Azure China, or that's the direction the team is heading, it's worth checking what's still blocked at the resource level. 

Use the China Readiness Report to identify any code-level issues, no signup required.