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The data acquisition and launching has been important in underwater system. The traditional test system has some disadvantages of high pertinence, bad compatibility and too much working load. A high precision system is promoted based on flexible testing technology. Its testing scheme and measurement is introduced including the core technology in hardware and software. The timing service bias is less than 200 ns and timing Synchronization bias is less than 100 ns between the shore and underwater systems. Six channels (more than 200 KS/s sampling rate) have been achieved, which are also Synchronous with two channels of launching data. This testing system has the advantages of high precision, extensibility and intelligence based on task resolved and executed automatically.