Here I will take the UEFI mode as an example to lead you to install the Ubuntu Kylin operating system on the basis of Windows system.

Step 1：Go to the official website to download the image of Ubuntu Kylin 20.04 LTS Pro .

Step 2：Download the corresponding boot disk production tool Ventoy

Step 3：When the download is complete, prepare a USB stick and plug it into your computer. Unzip to run ventoy and click installation。

Step 4：Copy the downloaded image into the ventoy disk。

Step 5：Partition the disk, compress under the disk you want to slice, and compress the new space to install Ubuntu Kylin。

Step 6：Restart the computer and install the system.When comes to choose the installation method, we need to choose custom install.

Step 7：Freespace corresponds to the partition that we just compressed.Then cick "add" to add root partition.After that, add data and backup partitions as data partitions and backup restore partitions.

Step 8：Click Next to start installing the system.Restart your computer after installation is complete.At this point, the dual system is already installed.