Laoshanmen Street，Located in Xicheng District, Beijing，It is named because the street is outside the gate of Beihai Laoshan Gate，Qing Dynasty known as Laoshanmen Street or Laoshan Gate，1965 Beihai Middle Crossing Road merged into the street，Determined as now name。From the south exit of Xuechi Hutong to the west，Near the east gate of Beihai，There is Bet365 lotto review a wide courtyard of a western -style gate tower。It was once an employee dormitory of the National Peiping Library，Historian Gu Jiegang、Tan Qizheng and other scholars have lived here。

Tan Qiyi (1911-1992)，Zhejiang Jiashan people，historian、The main founders and pioneers of Chinese history and geography，Main works include "Long Water Collection", "Long Water Collection", etc.。1927，Tan Qizhen turned into the Department of History and Sociology of Jinan University，Appreciated by Pan Guangdan。1930，He bet365 Play online games wrote a papers of more than 60,000 words "History of Chinese Immigration"，In the same year, I entered the Institute of Research of Yanjing University，Master from Gu Jiegang。1934，He assisted Gu Jiegang to establish "Yugong" half -monthly，Prepare the establishment of the Yugong Society。1955，He went to Beijing to host the editing work of "Chinese History Atlas"。

After the 1950s，Tan Qizheng to the Yellow River、Haihe、The changes in the water system of the middle reaches of the Yangtze River conducted bet365 Play online games a systematic research。He also found an unknown ancient Yellow River Old Road，This confirmed that the diversion in the lower Yellow River before the Western Han Dynasty was very frequent。The formation of his Haihe Water system、Shanghai's land process、Change of Dongting Lake、The formation of Poyang Lake, etc. I did a special research。These achievements are not only for natural geography、Historical geography research has significant significance，and also preventing Chinese disaster Bet365 lotto review prevention、Water conservancy development and modernization have realistic guiding significance。