At the site of cargo package binding in cargo spacecraft, the structure of the binding belt will produce plastic deformation, slip and fracture over time, which will cause tension relaxation and it's hard to predict the value of tension at steady state. A cargo packing test platform was established. Through which the tension data of sufficient time test are obtained by the serial tension sensor in the binding belt. Based on the Analysis of Therbligs a standard cargo packing operation procedure was developed. And based on the least square method, the tension data of the binding belt are fitted with quartic polynomial and the tension relaxation model is established. Test results show that the calculated values of the binding tension are in good agreement with the measured values, most errors are less than 5%, so that it can be used for predicting that tension relaxation of the binding belt of cargo package.
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