Abstract: On the basis of the characteristics of double-layer cylindrical lattice shell, a new semi-active sign-control strategy of certain bottom chords replaced by special controllable chords is presented. The controllable chord can change its state between stiffness and damp according to the relative dynamical response of two nodes. The program made by MATLAB language computes two shell examples and the results prove that the damping control effect can reach 70%. On this basis, the control effect of lattice shell at different replacing positions is compared.