Abstract: The effects of temperature change on axial force and deformation of inner support in deep foundation pits are obvious, and the axial force and deformation increment of inner support caused by the temperature difference cannot be ignored when the support length and section size are large. Based on the premise of inner support-retaining pile-soil interaction and deformation coordination, a simplified method for temperature stress with one-layer support and multi-layer supports is proposed by using the elastic resistance method. Based on the case of deep foundation pit with multi-level supports, the integration platform is used to realize the real-time, continuous and online automatic monitoring of the effects of temperature change in the support system in deep foundation pits. The feasibility and reliability of the proposed simplified method for temperature stress of multi-level horizontal supports is verified by the monitoring results, and it is proved that the integration platform is the most effective monitoring method for the axial force and deformation of inner support in deep foundation pits.