Abstract: Micro-leakage detection system of parking apron pipeline network based on simulation technology is intended to construct a simulation model, input pressure and temperature change data into it, calculate leakage rate of parking apron pipeline network, and judge whether micro-leakage really happens. This paper gives pipeline temperature/pressure/noise inhibition data, pipeline data calibration and leakage rate calculating method. It conducts a test for micro-leakage model of parking apron pipeline network based on a real running environment. The test results show that the technology enables to detect a micro-leakage of 0.04 L/(h·m³) within 50 min, and detection rate, sensitivity and reliability of the technology reaches the advancement level of the similar international products.