  Space debris is a major problem for all space-active nations. Adopting high
precision measuring techniques will help to produce the reliable and accurate
catalogue for space debris and collision avoidance. Laser Ranging is a kind of
real-time measuring technology with high precision for space debris
observation. The first experiment of laser ranging to the space debris in China
was performed at the Shanghai Observatory in July 2008 at the ranging precision
of about 60- 80cm. The experiment results show that the return signals from the
targets with the range of 900 km were quite strong with the power of 40W
(2J@20Hz), 10ns pulse width laser at 532nm wavelength. The performances of
preliminary laser ranging system and the observed results in 2008 and 2010 are
introduced in the paper.
