Abstract: Objective To discuss the reasons for the alterations of the conclusions in re-assessment for personal disability in road traffic accidents,work-related accidents and other accidents.Methods Forty five cases of re-assessing the personal disability from 2007 to 2009 in our institute were collected and analyzed.Results The disability grade of 12 cases(26.7%) was altered in re-assessment.The reasons for the alternation included assessment standard items misquoted,assessment time mischosen,injury misdiag-nosed and omitted,artificial prostheses mismanaged,injury-disease relationship erroneous judgment and disability grade promoted incorrectly.Conclusion The attention for assessment of disability grade should been paid to correct time for assessment,correct items of identification standard,appropriate medical and forensic technology,and correct understand about all relevant regulations.

Key words: forensic medicine, disability grade, re-assessment