PMN-PT crystals have been of considerable interest in recent years due to their excellent ferroelectric, piezoelectric, photoelectric propertiesand promising applications in various electric and electric-optical devices. However, the crucible leakage is usually a fetal limitation duringpreparation of the crystal. In this work, the PMN-PT crystals were prepared by Bridgman-accelerated crucible rotation technique (ACRT)method. The morphologies of the bottom surface of the PMN-PT crystal and the inner surface of the platinum crucible, in which the crystalgrew, were examined by scanning electronic microscope (JSM-840). The local composition was analyzed by EDAX spectrometer attachedto the scanning unit. Investigated results indicated that there are evident reaction between the platinum crucible and PbO-MgO-Nb2O5-TiO2melt during PMN-PT crystal growth, which is the main cause of crucible leakage. Another cause of the crucible leakage is due to the unequallydistorted platinum grain boundary.