In order to improve the service safety of aircraft, the concepts of Inherent Safety, Service-safety and Safe-service-envelope for aircraft are put forward. And, the architecture and connotation of the Safe-service-envelope for Aircraft (SSEA) are analyzed. The system of SSEA can be divided into Safe-flight Envelope system and Structural Life Envelope system for aircraft. Then the method to establish those envelopes is investigated, and the SSEA is built up. Besides, the application of the SSEA is discussed. The SSEA is a good development of usage restrictions which are incorporated in airworthy standard for aircraft. Utilizing SSEA in every phase of service, the safety of aircraft in missions and life-span can be greatly improved, and the service-safety for aircraft will also be promoted effectively.