Abstract: In view of problem that traditional wire temperature measurement method cannot be applied in high-voltage switchgear because of high-voltage insulation, a wireless temperature measurement system of high-voltage switchgear was designed. Designs of hardware and software of the system were introduced in details, existing problems of the system in test process were analyzed and corresponding optimal measures were given. The test result showed that the system can steadily run in working environment and meet requirement of free maintenance in 2 a with once installation.