Abstract: Due to its excellent economy and applicability,steel pipe spiral pile are the preferred form of PV brackets foundation in many PV power generation projects. However,there are significant differences in the calculation formula for the ultimate tensile bearing capacity of steel pipe spiral pile between the two domestic design standards for steel pipe spiral pile. How to choose more reasonable standard in practical engineering is troubling engineering designers. This paper takes the PV field area of a certain transportation energy integration project as an example,and obtains the tensile bearing capacity data of a single steel pipe spiral pile through onsite tests. The on-site test results are compared with the calculation results obtained under different standards,and based on the comparison results,application suggestions for the calculation formula are given. The research results show that:1) From the on-site test results,it can be seen that increasing the diameter of steel pipe spiral pile has a certain improvement effect on the single pile’s ultimate tensile bearing capacity,but the improvement effect is limited,which is a low cost-effectiveness. To improve the tensile bearing capacity of a single pile,it is recommended to taking measures in the direction of increasing the number of blades or blade diameter. 2)When designing PV power generation projects,it is recommended to use the calculation formula for the inverted cone bearing mode in DB41/T 2125—2021 to estimate the ultimate tensile bearing capacity of a single pile. The calculated results are the most conservative and closest to actual situation on-site.