Electrolyte not only plays the role of conducting ions in lithium ion battery, but also the thin layer electrolyte formed on the electrode surface determines the stability of electrode/electrolyte interface to a large extent, thus affecting the cycling stability, rate performance and safety of the battery. The successful commercialization and widespread application of lithium ion battery is closely related to the solid electrolyte interface film formed by the decomposition of electrolyte on the electrode surface. In this paper, the electrochemical stability and decomposition mechanism of the interface electrolyte are briefly reviewed, aiming to draw more scientists' attention to the electrolyte and its interfacial properties.