Based on a real project, the new technology of opening-reconstruction on the unbonded prestressed concrete slab has been presented in this paper, which includes the concept design, construction procedure, and application of post-assembly anchorage zm15 结合实际工程,介绍了无粘结预应力楼盖开洞改造工程的概念设计、施工程序、后装式组合锚具的应用等技术要点。