Abstract: The deployment process reliability of a satellite mesh antenna is analyzed and evaluated using the hybrid reliability model of interval and probability. Firstly, the failure tree model of the satellite mesh antenna is established, and the basic event of the failure tree model is classified. Secondly, the uncertainties involved in the key bottom events are divided into random variables and interval variables based on their characteristics. The failure probability of the corresponding bottom event is obtained using the hybrid reliability model. A two-meter practical model is made and the failure probability of the telescopic rod in the deployment process of the antenna is obtained according to the test method. The total failure probability and reliability of the antenna is obtained. Finally, an importance degree analysis of the basic event identifies the weak link in the failure of the satellite mesh antenna.