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Signal detection and processing system was designed for underground blasting vibration by the combination of software and hardware. The hardware part consists of sensors, memory, USB and other parts; it is responsible for collecting the original vibration signal. The software part is a virtual oscilloscope based on LabWindows/CVI platform, not only has the function of traditional oscilloscope, but also can complete the synthesis of vibration signals of different direction component, filtering, extract the vibration signal first break time and so on. Experimental results show that, in the 20 m * 20 m * 3 m shallow area, the system can take multidimensional vibration vector signal without distortion, and be able to show and process the vibration signal .It achieves the expected goal.