After the installation of lateral bracing, the effective length of column could be reduced, the stability bearing capacity and steel saving are profitted by it. Existing research focused in this area is insufficient, and the current design methods used in engineering field are not precise enough. In order to treat this problem, calculation equations were established based on the three-moment equation, and the influence of lateral bracing stiffness and residual stress were involved. A full scale test was conducted for comparing with the calculation result, and the test covered parameters Q420, 2L160 mm×14 mm, and λ=30~50. The relationship between lateral bracing and stability bearing capacity of column was acquired. The test results showed that the developed calculation method matches with these results, and is slightly lower than them. Though lateral bracing could enhance stability bearing capacity evidently, the maximum discrepancy between current design method and test results is larger than 20% for the simple reason that the method does not take the slenderness ratio into account. Proposed formula is the low limit of test and calculation results, and it can be a reference for such column during designing.
