A Chinese expedition team reached the target site of the North Pole (88.22°north latitude, and 177.20°west longitude) at 15:38, August 20, 1020, aboard an expedition boat named Snow Dragon. In the 4th trip to the Pole, team members deployed drifting buoys over the ice surface, made deep sectional salinity observation, collected sea ice and water samples, and made biological observation at the site. They obtained temperature and salinity data of sea water at a depth from 0m to 1000m, 3 ice core samples, and some sea water specimens. They also made an observation of sea ice distributions on the way, and collected valuable scientific data for studying the fast changing sea ice and the response made by the marine ecosystems.