上海世博会车载系留气球光电平台集成了多种对工作温度有严格要求的高精密光学设备，设备工作环境复杂，平台重量、功耗等技术指标约束严格。本文采用Sinda/Fluint 软件建立了光电平台及载荷设备的热模型，根据计算结果对球载光电平台及其核心设备进行了有针对性的热设计，采用主动热控与被动热控相结合的方法，使整个平台满足热设计指标。实测结果表明，仿真结果与实际值吻合较好，光电平台各设备运行良好。

Multiple optical payloads are integrated on an opto-electronic platform of tethered balloon for the surveillance of Expo Site of Shanghai. These optical payloads are exigent for the working temperature in order to get high quality image. Thermal models of payloads and the platform itself are built by Sinda/Fluint software. Based on the thermal model, a specific thermal design is worked out for the payload and the platform. The approach consists of both active and passive thermal control measures. It is showed that the thermal design is satisfactory by software simulation.