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Centrifugal compressor is a piece of key equipment for the modern production.Among the components of centrifugal compressor,impeller is a pivotal part as it is used to transform kinetic energy to pressure energy.Blade crack condition monitoring and classification has been broadly investigated in industrial and academic area.In this research,pressure pulsation(PP)sensor arranged in close vicinity to crack area and corresponding casing vibration signals are used to monitor the blade crack information.As these signals cannot directly demonstrate the blade crack,the method employed in this research is based on the extraction of weak signal characteristics that are induced by blade cracking.A method to blade crack classification is present by using squared envelope spectrum(SES)based on the monitored signals.Experimental investigation on blade crack classification is carried out to verify the effectiveness of this method.The results show that it is an effective tool for blade crack classification on centrifugal compressor.