In the present day, the heavy crystalline missions in the sunrise, which is still the practice of low flow in the world on August 8, 1999 (Lunar calendar June 27, 1999), China's first self-developed "Practice No. 5" satellite successfully completed the mission. On August 8, 1999, the small satellite "Practice No. 5" loaded with China's self-developed public platform, weighed 300 kilograms, weighed 1.2 cubic meters, operated normally for 90 days since May 10, 1999 and successfully completed the mission, obtained a lot of data and many results. Launching the small satellite is the international satellite development trend since the 1980s. According to the introduction, this platform is equipped with China's self-developed CAST968 public platform. This is the first experiment