The MIUI Global ROM comes with Google Play Store pre-installed but in MIUI China ROM do not comes with Google apps pre-installed.
As of now, the MIUI 9 China Developer Beta is available for beta testers. This MIUI 9 Developer Beta ROM does not come with Google apps installed.
This step by step guide will show how to install Google apps on MIUI 9 Developer Beta ROM. This is a simple and easiest method. You do not need to flash any ZIP file, do not need a rooted device as well.
Here is the step by step guide to install Google Apps on MIUI 9:
Step 1: Enable “Unknown sources”. To do this Settings-> Additional Settings->Privacy->Enable Unknown Sources.
Step 2: After enabling unknown sources to go back to home screen and open Mi Store. In the app store search the term “Google”. Scroll down and you will find a blue and click on this icon.
Step 3: After installing launch the app. You will see a window which will show a blue circle on the screen.
Here is the video showing all these steps to install Google Play Store in MIUI 9:
Step 4: Now click on this blue icon and it will start downloading the required Google apps for your device. You will download Google Services, Google Play Store, Google Calendar, Google Sync and much more.
Step 5: Every time an app is downloaded it will ask to install permission. Click on the install button to install the app on your device.
You’ve successfully installed Google apps on your MIUI 9. Enjoy!