New Chinese laboratory module will be launched for further technology trials before planned for 2020 start of assembling first Chinese modular space station. Tiangong-2 is larger version of Tiangong-1 with mass at 20000 kg, length at 14.4 m and diameter at 4.2 m. It will provide life support for three crew members for twenty days. Module will be launched on atop of Long March 2F/G rocket - modified version of Long March 2F. Improvements were necessary to provide capability of rendez vous and docking by using upgraded navigation system, complex guidance system and modified boosters for loading more propellant. Mission is planned for 3rd quarter 2016.