Immediate breast reconstruction could be done by using tissue expander or autologous tissue transfer. The purpose of this study was to access operation time, length of stay in hospital and economic benefit and compare complications of each method after immediate reconstruction respectively. A total of 23 conse-cutive patients(23 cases) were studied done immediate recon-struction from December 1996 to August 2003. 16 of total patients had immediate breast reconstruction using the tissue expander: Among these, 10 patients had the permanent expander-implant (Mentor siltex spectrum