本文介绍了青岛裕泰大厦已建成部分主体结构的改造设计与施工。经调查分析和充分利用楼层整体提升等先进技术，在不干扰周围环境的条件下，在规定期限内完成了主体结构的改造、补强、改变楼层层高以及扩建等工作。 This article introduces the transformation design and construction of the main structure of the completed part of Qingdao Yutai Building. After investigation and analysis and making full use of advanced technologies such as the overall upgrading of floors, the main structure has been completed, reinforced, and the floor height has been changed and the expansion has been completed within the prescribed time limit without disturbing the surrounding environment.