In view of the pivotal role of rolling bearing in rotating machinery and equipment， it is very important to diagnose the fault， and it is the best way and means to establish a set of efficient and convenient bearing fault diagnosis Most of the traditional diagnostic system depends on a number of professional hardware equipment， these instruments are obviously difficult to meet the requirements of information technology， and caused a lot of hardware With the rapid development of computer technology， the virtual instrument technology has been applied to the field of bearing fault diagnosis has become a This paper introduces the characteristics and structure of virtual instrument On this basis， the resonance demodulation technique is introduced into the signal analysis of virtual instrument to extract and analyze the bearing fault Finally， based on LABVIEW platform， a set of virtual instrument for bearing fault signal analysis is
