At about 8 pm on August 27th, 1987, Chen Feng, an intern in the observation field of Shanghai Longhua Meteorological Station, made a routine inspection of meteorological instruments. When she finished copying the data of the blinds, she looked up professionally to observe the clouds in the sky, but she only caught a spiral UFO. She called the Central Meteorological Observatory at once, but the radar here showed nothing unusual. Chen Feng, an observer at Longhua Meteorological Station of Shanghai Meteorological Bureau, said in an interview: "At that time, it was as big as a bowl cover with a long fiery red tail at the back. From west to east is a relatively stable parabola, that is, spiral flight. Probably the whole process I saw took 1 ~ 2 minutes, and then it was gone. " Wu Jialu, Lou Jinhong and other UFO enthusiasts in Shanghai subsequently collected hundreds of witness reports. The witnesses are not only from Shanghai, but also from East China such as Zhejiang and Fujian. Most witnesses said that the UFOs they saw were spiral, and some people saw electric fans or fan corners.