Temperature-dependent stress has become one of the main factors that impair the structural safety of the supporting tube bus system of substation. Based on the structural stress constraints of the supporting tube bus insulator, the influence of the installation temperature of the tubular bus system on the allowable range of operating temperature change is studied in this paper. Based on ABAQUS, the finite element simulation model of the supporting tubular bus system of substation is built. The temperature-dependent structural stress simulation of the tube bus system is carried out in high-temperature installation and low-temperature installation scenarios separately with the traditional 1/2 installation method. A mathematical model of quantitative fitting between temperature range and stress is constructed. Based on the conclusion that high temperature and low temperature installation are not conducive to the allowable temperature change of the tubular bus-bar, a calculation method and engineering countermeasures are proposed of the installation position of the sliding fittings considering the installation temperature. The research results can provide guidance for the engineering installation and safe operation of the substation hard tubular bus system, and have engineering application value.