| As the quick development of light gauge steel structure system, cold-formed high strength thin-walled steel has been widely used abroad in the last years. It has got high economic benefit to use cold-formed high strength thin-walled steel in low buildings. For its superior performances, our country also began to study its performances under load and application in the engineering.A group of ten high strength cold-formed thin-walled steel wall studs with C section were tested under axial compression. From the test we got their deformation, failing modes and load-carrying capacities. Finite element analysis software ANSYS was used to analyze wall studs under axial load. The analysis showed that under axial load studs without straps failed in the mode of flexural-torsional buckling and studs with steel bracing occurred local buckling and distortional buckling. Which were in conformity with the tests. And the load-carrying capacity of speciment were also in good agreement with the experimental results.It showed that it would bring in big deviation if we calculate the wall studs' capacities as members with both ends simply supported according to the method provided by "Technical code of cold-formed thin-walled steel structures" (GB50018-2002). This paper used a new method, which considering the material characteristic of high strength steel and the supporting effect of the steel bracing and the effect of the self-drilling screws connection condition of the stud's bending, to calculate the wall studs' load-carrying capacities. This new method was at the bases of the codes and the results were in good agreement with the experimental and analyses results.
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