Abstract: Xiluodu right bank-Guangdong ±500 kV double circuit DC transmission project is the first ±500 kV double circuit DC transmission line in China. This paper introduces the key point of the tower designing. The SJ101 was subjected to design and test under cooperation conditions including wind, anchor-wire, broken wire etc. After comparing the test results with the theoretical calculation, the main causes of test error are analyzed. The result show that the actual displacement and stress of the tower SJ101 are in agreement with the theoretical calculation. Finally, the tower collapsed with the test overload 120%. The results are consistent with the design expectations, and show that the tower design is safe and reasonable, and provide the scientific basis and reference for the engineering design.