Abstract:A distinct characteristic of large tethered balloons is floating for a long time in the sky, which determines that the measure-control system working steadily and reliably is especially important. Based on the makeup of measure-control system of large tethered balloons and software architecture, some design considerations and engineering realization methods for measure-control software on balloon (including initialization, communication process, data process, balloon control, communication station control and emergency treatment) and display-control software on ground were presented. It is proved that dual redundant design is one effective way to improve the reliability of measure-control systems of tethered balloons by engineering practice.