Abstract: The current-temperature model of overhead conductors has used as the theoretical foundation of various areas, such as dynamic capacity-increasing decision, safe operation monitoring and ampacity evaluation. However, ACCC conductor is different from traditional overhead conductors on material, construction and operating temperature. Consequently, the current model cannot be directly applied to ACCC conductor, which has limited the development of dynamic capacity-increasing and the promotion of transmission capacity for ACCC conductor. This paper proposed the current-temperature model for ACCC conductor considering thermal equilibrium principle and thermoelectricity analogy theory. And then PSO identification method was used to identify the model parameters. Finally, a temperature rise experiment platform for current-carrying ACCC conductor was established to measure and simulate the dynamic thermal process of ACCC conductor within natural convection condition. The result shows that the model parameters can be obtained effectively by PSO identification method, and the model is high in precision while calculating the temperature rising process for ACCC conductor.