A technique based on vibration measurement and analysis was used to study the breakage of mono-size dolomite on a hydraulic press. Up to a maximal pressure of 4 MPa, vibration signals during pressing and breakage of dolomite were picked up with two piezo-electric type accelerometers, which were screwed on to the breakage chamber and oriented in perpendicular directions. The source vibration signals were amplified and stored on a DAT recorder. A ＇＇stereo＇＇ picture was built-up for describing the breakage events based on two-channel vibration signals. The saved time-domain waveforms were converted into digital format for the personal computer; thus, the breaking history may be replayed by plotting and zooming the waveforms, from which the frequency-domain power spectra were transformed, Primary studies showed that the most significant changes on the power spectra were on the frequency range of 500 to 2500 Hz, and were caused mainly by changes in the feed sizes to the crushing chamber, Relations between the vibration signal characteristics and the parameters in mono-size breakage events were derived by multiple regression based on principal component scores. It is shown that vibration signal measurement may provide additional information for studying single particle breakage events. Two examples are used to demonstrate the application of principal component analysis.