On November 24 this year, my country will launch the Chang’e-5 lunar probe with the Long March 5 at the Wenchang Space Launch Center. Sampling returns. The ultimate goal of my country’s lunar exploration is to manned landing on the moon and establish a base on the moon. However, to achieve manned landing on the moon, it is far from enough to rely solely on the current Long March 5, and a more powerful launch vehicle is needed. Previously, the manned moon landing rocket planned by our country has Long March 9 and 921 rocket, but at the recently opened 2020 Space Conference, this plan was adjusted.