| This paper introduces the virtual instrument and advanced bus technology, introduces the working model of traditional multi-channel analyzer and its weakness. Particularize the whole process of research and development virtual multi-channel analyzer with PCI-DAS4020/12 DAQ board of ComputerBoards Company and LabVIEW software development platform based on virtual instrument technology. Introduce the system structure design of virtual multi-channel analyzer, particularize the functions of every modules and its software implementation method.Virtual multi-channel analysis system realizes the double 2048 channels amplitude analysis of nuclear pulse and pre-processing of spectrum data. Design a new method to obtain pulse amplitude in real time pulse processing, realize the single parameter amplitude analysis of positive-negative double polarity pulse, realize real time display of double 2048 channels spectrum. In the spectrum data processing and analysis, spectrum smoothing, peak find, the computation of peak net area in region-of-interest and other functions about spectrum pre-processing are also finished. User can use not only five-point smoothness but also new filter-smooth method to smooth spectrum data. User can choose filter parameters to form an appropriate digital filter for obtaining the best effect about spectrum smoothing. For realizing the spectrum's saving and off line reading, we design configuration file and data file to save or read nuclear spectrum as well.Virtual multi-channel system makes the most use of computer resource, so it has many virtues such as shareable resource, use flexible, friendly interface, cost lowness, easy to extend and modify. We had use this virtual multi-channel analysis system to measure actual nuclear pulse signal, obtain the right result of C06O nuclear spectrum by HPGe detector and this virtual multi-channel system.
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