The study was taken in order to evaluate vibration limit value for an aeroengine and to improve its safety in utilization. Based on the analysis of characteristics of the engine structure and its rotor bearing, a model was built by means of rotor dynamics finite element methods. The dynamic performance of engine rotor was investigated. It points out that gas turbine case is key point for vibration monitoring. Field vibration tests were carried out according to the findings. Vibration data were fully studied. According to principles for rotating machinery vibration standards, the vibration limit values for field ground test were put forward, which was suitable to engineering.