Abstract: The materials comprised of epoxy resin with glass fiber reinforcement were studied and tested in this paper so as to obtain their relevant material properties. According to the preceding results,the experiment for stability of composite tubes was carried out with different cross sections and geometric lengths. And therefore,we achieved some laws of stability bearing capacity and failure characteristics for slender components made of composite material. Next we proposed a modified Perry-Robertson stability formula in order to ascertain corresponding stability coefficients of different slenderness ratio components. By comparing the test data with the results derived from different formulas,we found the proposed approach shows better agreement to the test results than others.