Preparations for the launch mission scheduled for October are underway at the center, the release said.
Mengtian is more than 17 meters long, has a diameter of over 4 meters and weighs more than 20 metric tons, according to designers at the China Academy of Space Technology.
Scientific equipment in the lab will be used for microgravity studies and to carry out experiments in fluid physics, materials science, combustion science and fundamental physics, designers said.