Abstract: The highly integrated array antenna has become the mainstream of radar antenna development because of its high precision, large range and multi-function. However, the high integration of electronic components leads to high thermal power consumption of the antenna array and deterioration of the electrical performance of the antenna. Therefore, efficient heat dissipation design is essential. Microchannel heat dissipation device is a heat exchanger based on fluid heat exchange. A good microchannel layout structure plays an important role in stabilizing the work temperature of the antenna and ensuring the control accuracy of the antenna. The finite element model of microchannel of antenna is designed in this paper based on ANSYS software, the structure parameters of microchannel are optimized according to the heat transfer efficiency and two microchannel heat dissipation structures (serpentine channel and U-loop channel) are designed. Based on the heat transfer efficiency and engineering practice, the structure is further optimized and two more suitable integrated heat dissipation structures are designed.