In order to reduce the over standard fluctuation of optical fiber parameters and improve the effective drawing length, based on OVD manufacturing technology, the core rod and handle connection process and its relationship with optical fiber parameters near the interface are studied. The connection process of core rod and handle using automatic computer numerical control lathe is described. The influence of connection process on optical fiber performance is analyzed theoretically, and comparative experiments were carried out by drawing the core rods with different connection process. The experimental results show that the one-time coincidence rate of the core rod runout value can be increased from 90% to more than 98%. It is established that the extruasion dgree DD0 which is beneficial to reduce the fluctuation of mode field diameter is 1.2, and the hydrogen oxygen ratio 2∶1.1 is the optimal connection parameter for the optical fiber water peak performance without interface bubbles.