Abstract: To solve the problem on efficient array calibration of bottom-mounted underwater long baseline acoustic tracking system, a packet parallel array calibration method derived from actual engineer project is proposed. The method utilizes the measurement data of sonar and DGPS obtained at the time of implementing the array layout as a benchmark, adopts a shortcut manner of dividing multi-arrays into packets for simultaneous calibration test, and makes array calibration error convergence measurement according to the automatic feedback measured data. As long as meeting the pre-set calibration error, the precise location information of underwater base array is obtained, and then the underwater multi array's attitude calibration is completed. Finally, the method is verified by ship-running tests, the trajectory measured by the Long Baseline acoustic tracking system coincides well with the one measured by DGPS. It's proved that this method has advantage in high degree of intelligence, high precision, high array measuring efficiency and cost saving, with very high military and civil values.