Erikson's theory of self-identity is the core paradigm for understanding adolescent development. However, the existing research and measurement tools have significant fragmentation limitations, overly focusing on the psychological dimension and relatively neglecting the systematic examination of physical, mental and social integration. This article aims to critically inherit the Erikson 's theory, then, integrate embodied cognition and existentialist psychology and social identity theory, and finally, propose a " body mind spirit social" four-dimensional integrated self-identity model ( BMSSII Model). This model conceptualizes self-identity as a dynamic process that seeks unity and coordination in multiple dimensions. It elaborates on the connotation, structure and interrelationships of four subsystems of bodily perception, psychological coordination, spiritual meaning and social connection. The construction of this model not only provides a more comprehensive and ecologically valid theoretical perspective for understanding adolescent identity development, but also provides a theoretical basis and practical path for the development of multidimensional assessment tools and the design of localized integrated intervention programs with psychological resilience as the core in China.