There are huge benefits for China!
Pakistan is a vital geostrategic artery for us, considering
Gwadar port and the KKH which will allow our ships to bypass the Indian ocean. Then we have the connection to Iran which enables pipelines to travel directly into western China. This of course then relies on the land link between Pakistan and China, which is Pakistan's northern areas, the areas that are under discussion.
Pakistan is also our gateway to the Muslim world. Pakistan argues for us in the OIC, and enables us to develop strong relations with other Muslim nations which are strategically
essential for a growing economy like China.
Most importantly, Pakistan is one of China's oldest and closest allies. Even during the time when China had very few friends in the world, Pakistan was always there for us. And the alliance will keep growing stronger and stronger as time goes on.