近年来,自然灾害频发,历史街区易遭受到自然或人为的破坏。拉萨市八廓街有1300多年的历史,街区内古建筑众多,建筑质量较差,小巷曲折,人口密度较大,难以疏散。该文从微观上提出具体的改进措施,这些防灾设计要点对于保护人民的生命财产安全和维护八廓街这一老城区及其中的历史建筑的安全具有一定的参考价值。 In recent years, natural disasters have occurred frequently and historical streets are vulnerable to natural or man-made destruction. The Barkhor Street in Lhasa City has a history of more than 1300 years. There are many ancient buildings in the block, the construction quality is poor, the alleys are winding and the population density is large, and it is difficult to evacuate. This paper proposes specific improvement measures from the microscopic point of view. These disaster prevention design points have certain reference value for the protection of people’s life and property safety and for the maintenance of the history of the archaic area of ​​Barkor Street and its historic buildings.