Abstract: In the present paper, the stability of a Beck-type laminated column is investigated. The characteristic equation of the column is derived according to Timoshenko beam theory. The effect of. ply angle on the critical values is discussed. For an example given in the paper, the characters of variation of critical values with ply angle are calculated. The results show that （1）the ply angle of a Beck-type laminated column has a remarkable effect on its critical values, and the actual critical frequency and load decrease sharply as the ply angle increases while other factors remain unchanged; （ 2） for a Beck-type laminated column with definite slender ratio and large shear parameter, the effect of ply angle on the actual critical values is principally reflected in that on the bending stiffness of the column.