Abstract: Smartball drifting leak detection system is composed of host,smartball.voice receiver(SBR)and receiver(AGM).The systems working principle is that the voice sensor integrated in it is to used to collect the low-frequency sound wave signals of pipe leakage.Because the magnitude of the signal is proportional to the velocity of leakage rate,therefore the leakage position will be determined,and through AGM of built-in GPS module installed above pipeline,leak positioning accuracy is effectively improved.On September 15th.2009.the Smartball system was applied in Zhong Zaohuo-Golmud Section of Huatugou-Golmud Oil Pipeline.A leak hole was found at a distance of 70 499 m from the transmitting terminal of Smartball system,appearing a 0.5L/min of leakage rate.Verification on the detection results and actual position of pipeline leak showed that positioning error was only 2 m.It has been found that this system could effectively detect and locate the tiny leakage in pipeline with high adaptability.high detection precision,easy to use and high efficiency.