Abstract: According to the original drive structure of ICRF antenna without accurate positioning during ICRF antenna moving for it has no function of self-lock, two types of new drive structure, which are mainly composed of stepper motor and reducer consisting of turbine and worm gear, were designed for ICRF antenna. They have the advantages of slow starting, big propulsive force and accurate positioning. The calculation together with theory analysis was carried out for the starting torque, the strength and the stability of the screw rods of two drive structures, and the results satisfy the design requirements. The new drive structures and analysis methods applied for this ICRF antenna will be good reference for the other same device.