Abstract: According to the communication requirements of Leo satellite constellation, a laser communication equipment structure based on double Risley prisms and quadrant avalanche photodiode (QAPD) was designed. The scheme was beaconless optical system. It had the characteritics of small size, low weight and large field of view. In this paper, the calculation model of input and output light of double Risley prisms structure was given. On this basis, the interstellar of pointing, capturing and tracking was proposed, then in orbit test and verification were carried out on XY-2 satellite. The pointing offset was updated, based on pointing test, the QAPD tracking point was calibrated, and the two-way link up with the XY-2 satellite test was carried out. The bidirectional chain building test which was repeated 15 times showed that the acquisition time of the laser communication equipment was less than 20 s, and the acquisition success ratio was 100%. After the acquisition, the chain building time of the two satellites was better than 2 s and the linking success ratio reached 93%, and the RMS value of tracking accuracy was less than 30 μrad.