This article is based on the idea of peridynamic and the differential operator. Firstly, the effectiveness of the model is verified through uniaxial tensile test results. Then, based on the peridynamics heat conduction equation and motion equation, considering the high-temperature performance degradation of ECC, a peridynamics thermos-mechanical coupling model is proposed for analysing ECC damage at high temperatures. A peridynamic numerical model for the thermal fluid mechanical coupling of ECC and concrete in fire scenarios is proposed by combining the peridynamic thermal mechanical coupling model of ECC damage at high temperatures and the peridynamic model of thermal fluid. Based on the microstructure of concrete and the interface correction method in peridynamics theory, a heterogeneous peridynamics model of multiphase (aggregate phase, mortar phase, interface phase) concrete was constructed, and the effectiveness of the model was verified through compact tensile tests.