The Shanghai Stroke Service System（4S） has been established as the network of stroke care in greater Shanghai metropolitan area. The system includes 11 territorial-care hospitals and their comprehensive stroke unites that provide 24h/7day acute stroke care to a population of 40 million in Shanghai. The System comprised of two consecutive phases, the acute phase that emphasized on providing thrombolysis, and the in-hospital phase that concentrated on the effort of recovery and secondary stroke prevention. The novel electronic data aquisition system provides the contiguous data of clinical care of stroke patients from the acute phase of management to inpatient rehabilitation. This system has been implemented and maintained as an ongoing quality of stroke care project that monitored the process of routine stroke care in Shanghai. It is funded by the Shanghai Municipal Commission of Health and Family Planning. Our analysis of the project was approved by the Ethics Committee, which agreed that no written informed consents were needed since the study only was consisted of a population-based retrospective data analysis.