Abstract: In order to achieve the purpose of ballistic missile possession, the thermal network mat-hematical model and the difference method are used to calculate and analyze the surface temperature field distribution of the spherical target, so as to study the infrared radiation characteristics of the space target. The results showed that the deployment of a set of aluminum-based balloons or a group of differently coated balloons can reduce the target recognition rate, and the alumiumbas-edcoated balloons have better stealth effects.