Si He Yuan is a classical architecture style of residential housing of Beijing citizens dated from the Ming Dynasty.The narrow streets between the Si He Yuan are called "Hutong"s.A single implementation of Si He Yuan comprises of garden surrounded by four houses and protected by high walls.Si He Yuan with Hutong which have been very familiar for people,having a history of more than 700 years now suffer from the urban renovation and economic development of China,and they are slowly disappearing from Beijing.