Abstract: Situated cognition develops and shapes the theory of situated learning under the guidance of social practice philosophy in cognitive science. It helps to form a socio-cognitive approach to second language acquisition (SLA) which narrows the gap between social and cognitive linguists in SLA field, and enhances their cooperation. Researchers adopting socio-cognition view put forward three principles in SLA: inseparability, adaptability and alignment, and explain SLA in the models of connectionism, alignment and interaction. Nowadays, there are three views about socio-cognition approach to SLA, which are socio-cultural theory, holistic theory and synthetic theory.