At the China Aerospace conference held in Nanjing, Hu Hao, chief designer of the third phase of the lunar exploration project, said,The chang'e-5 mission originally planned to sample 2000 grams, including 1500 grams for surface sampling and 500 grams for drilling sampling.
In the actual sampling on the moon, the target of surface sampling was successfully achieved, but some obstacles were encountered during drilling. In this plan, the depth of 2 meters was drilled, but only 1 meter was drilled. Finally, more than 200 grams of samples were drilled.
A total of 1731 grams of samples were obtained, 269 grams less than the original plan.