The deformity of plagiocephaly is roughly divided into mechanical and congenital plagiocephaly, the previous one is caused by external force, while the latter can be caused by craniosynostosis or other craniofacial deformities. This kind of disease do not belong to any pathological changes whatever the reason of the plagiocephaly is, the appearance of the patient’s outlook is the main characteristic that takes our high considerations, so as the long-term concern to the mental problems, which may trigger a series of psychological diseases. Thus, early treatment is crucial. In order to have a better understanding of the oblique head deformity, it is necessary to classify the plagiocephaly of different degrees with the aim to give the most appropriate and effective treatment with the evidence provided for the clinical diagnosis and clinical use. In this paper, the clinical measurement and classification of plagiocephaly were reviewed.