To study the stability capacity of long cold-formed thin-wall channel columns reinforced with CFRP, the axial compression loading test was carried out on them with CFRP around their webs and flanges. Seven columns, which are 1 400 mm long each, are consisted with one initial specimen and six strengthened with 50 mm width CFRP. The CFRP space is divided into three sorts, 50 mm, 100 mm and 150mm. And the CFRP layer has two kinds:one and two layers. The experimental results show that the global buckling happens to all the specimens. All the ultimate bearing capacity of the reinforced members is improved in different degrees. Meanwhile, the effect of the reinforced specimens wrapped with two layers CFRP is better than the others wrapped with one layer CFRP. Finally, based on the experiment, the numerical simulation is carried out, and the test and numerical results show in good agreement.