The vibration test system was designed to ensure the normal operation of petrochemical smoke turbo-generator. According to its feature of mechanical vibration, a mathematical model of vibration signal was conducted, and the method of vibration signal analysis was presented. Evenlope analysis of vibration signal was offered by applying Hibert transform, and the signal was demodulate by combining with FFT. Not only the hardware structure was introduced whose key elements are computer and date acquisition card, but also software control flow of the vibration test system was proposed which was based on the LabVIEW software platform, as well as its function of collecting date, processing and analyzing signals was redized. At the same time, the test system software program was presented. Practical application shows that the test system accurately detect mechanical abnormal vibration, and can be effectively used in on-line detection and fault diagnosis of machine.