This paper introduces damage extraction and loss assessment methods and key technologies of earthquake emergency four work modes based on remote sensing, which are quickly display of post-earthquake images, rapid and rough damage assessment mode, standard damage assessment mode and detailed damage assessment mode. According to their workflows, Tianjin Remote Sensing Earthquake Damage Analysis and Processing System (TJ-RSEDAPS) was designed and developed to achieve image management, damage degree identification of buildings, key-objects and major facilities, losses assessment of life and economic, damage distribution mapping, and information service. The main functions are performed in detail.