The major research contents of this project are as follow：
(1) To study the technical reports for seismic retrofit， the domestic retrofit construction cases， the investigation results of earthquake damage to screen out the appropriate retrofit method for those high-rise RC buildings with soft-weak bottom story.
(2) To conduct a comparative study of the Taiwan "Draft Regulation for Seismic Evaluation and retrofit of Existing Buildings " and Japan's "Promotion of Earthquake Retrofit of Buildings"， and propose the possible strategies to improve the resident’s willingness at the conducting of seismic retrofit of home building.
(3) Refer to Japan's seismic evaluation method， propose a simple seismic evaluation method that can evaluate the collapse possibility and stability of buildings under earthquake， and provide a retrofit design strategy for buildings with soft-weak story.
(4) To collect the information of those damaged buildings with soft-weak story in the past earthquake and relative research literatures， estimate the formula for calculating the structure period considering the cracking and damage status of structural members.
(5) For those mixed-use building structures， select three representative structures， conduct seismic evaluation and retrofit design according the method proposed in this study， and discuss feasible retrofit strategies under consideration of economics， space limitations， and existing functions.