Abstract: During the PhaseII project of NSRL, in order to monitor the injecting effectiveness, damping rate and Beta oscillation after update of injection and RF system, a turn-by-turn system of HLS has been produced for storage ring diagnostics. Timing system is an important component of turn-by-turn system. It provides synchronous clock signal with certain bunch in storage ring for data acquisition system. Programmable time-delay and remote control are available in this system. Total time-delay range of this system is 220ns, step 0.5ns. Time jitter of clock signals is less than 200ps.