Various companies, including the state-owned China Aerospace Science and Technology Corporation plan on launching reusable rockets in the coming years. CASC's announcement was made yesterday. Before then, I believe they only had plans to make the Long March 9 superheavy rocket reusable in the 2030s? Or maybe I missed some news a while back. China's space industry is very convoluted. I should probably make a master post about it sometime for everyone's sake.
The Long March family spans from small lift to (eventually) superheavy lift rockets. It's just the name of CASC's series of rockets. Like if NASA called everything a Saturn something, rather than just using that designation for Saturn I and Saturn V.