A rotating laser-scanning measurement system utilizes a photoelectric-scanning timing method and combines the principle of space-time conversion to provide angle-rendezvous positioning. The accuracy of the time-domain information in the photoelectric signal is an important factor， which affects the measurement accuracy. To address the problem of delay in the synchronization signal in the measurement system， we propose a delay-evaluation method that uses forward- and reverse-measurement targets on the transmitter base-station turntable according to the characteristics of the angle-measurement error. By quantitatively analyzing the delay in the synchronization signal， we first establish a delay model for the synchronization signal. Using a programmable logic device， we then analyze the influence of the delay on the accuracy of the angle measurement， study the algorithm used to compensate for the synchronization signal circuit delay， and design experiments to verify it. The experimental results show that the proposed method can effectively compensate for an original circuit delay of approximately 190 ns in the synchronization signal.