Abstract:Beihai Kuaixue hall traditional architecture group is located in the north bank of Beihai. Kuaixue hall was built in 1779 (44 years of Qing Dynasty), and was occupied by Beijing Library in 1925 . Chengguan Hall, Yulan Xuan and other buildings in the courtyard preserved a large number of early architectural colored pattern paintings, which belong to the mid-Qing Dynasty works from the perspective of decoration, color and treatment techniques, and have high cultural relic retention value. In order to protect this batch of cultural relics, the full investigation and analysis of oil decoration painting, the development of oil decoration painting design scheme, through the restoration of the mid-Qing Dynasty style of colored pattern painting original appearance.