Abstract: Dynamic line rating is an important technical means to solve the problem of transmission section congestion,and the thermal stability of conductor is the key to restrict the development of the dynamic line rating technology. The paper uses finite element method to analyze the temperature distribution law of LGJ400/35 aluminum conductor steel reinforced under different loads,designs a wire temperature sensing system based on wireless sensor technology,establishes a wire temperature test platform,obtaining the change law with the load of the wire temperature and the influence of wind speed on the wire temperature. The research shows that when the conductor current is constant,the wind speed rises from 0 mm/s to 2 m/s and the maximum reduction in the conductor temperature is18.1 ℃.