Abstract: Cable-supported photovoltaic support (CSPS) is a new type of support structure for solar farms with large span and high headroom, which is gradually applied in a large scale in fishery and agriculture solar farms. Due to the lack of proprietary design specifications, the structural design of CSPS mainly refers to JGJ 257−2012 and NB/T 10115−2018, but the reasonableness of partial factor values of material and load still needs further discussion. In the present study, based on the probabilistic limit state reliability theory, the issue of partial factors of material and load is analyzed, taking a 30-meter span CSPS solar farm in China as a case study. The results show that, the CSPS solar farms designed according to JGJ257−2012 is generally conservative, with low value for wind load partial factor and high value for cable resistance partial factor; in the CSPS solar farms design, the recommended cable resistance partial factor is 1.2, and the recommended partial factors of dead load, prestressing and wind load are 1.1, 1.1 and 1.6, respectively.