First, download the corresponding flutter SDK
https://flutter.cn/docs/get-started/install/windows#
Second, unzip the SDK, random location. As shown below
Third, unzipped flutter open the folder, find the bin, copy the address shown below
Fourth, set the environment variable -
Environment Variables -> System Variables find -> Path -> Edit -> New -> Paste - Save
Fifth, the domestic mirroring configuration.
Environment variables -> Find a user variable -> click New
FLUTTER_STORAGE_BASE_URL 值：https://storage.flutter-io.cn
PUB_HOSTED_URL 值：https://pub.flutter-io.cn
Sixth, restart the computer
Seven, in the lower left corner of the desktop enter cmd, open a command prompt. Enter flutter doctor. Check the configuration items. As shown below: