In view of measurement requirements in the underwater explosion test such as freespace pressure, wall pressure, acceleration, etc., putting forward the design train of thought and test methods based on the distributed measurement technique. The method fully considers measuring multichannel, high realtime demand, high reliability demand in the underwater explosion test. By adopting distributed measurement way and CAN communications in distributed explosion measurement system, the data acquisition, transmission, and fault upload of measurement unit are managed and controlled. So the system reliability is improved, and measurement data collection is ensured. In laboratory, the reliability of trigger acquisition is tested with two simulated trigger signals. Experiments show that the system can be triggered reliably with any one trigger signal. This system is successfully applied to explosion test, it is more flexible, more convenient, and more reliable than other measuring equipments.