Abstract: Objective To compare the changes of bullying behavior among secondary school students in 2017 and 2008, and to provide a basis for relevant prevention and control.Methods The questionnaire survey was conducted in shenyang, anshan and fuxin cities of liaoning province in 2017 and 2008 respectively, with 2 842 students surveyed in 2017 and 3 052 in 2008.Results Compared with 2008, boys dropped only "be maliciously teasing" in 2017 (P>0.05), "threatened/intimidated" obviously increased (P<0.05), "beaten/kicked/pushed/squeezed/closed ", "be laughed at by physical defects/looks", "asked for property", "intentionally excluded/isolated" all have risen, but the difference was not statistically significant (P>0.05); In 2017, the decline of girls was " maliciously teasing " (P> 0.05), " beaten/kicked/pushed/squeezed/closed " slightly decreased (P> 0.05); and " be laughed at by physical defects/looks", " intentionally excluded/isolated ", "threatened/intimidated", "asked for property" has increased, the difference was not statistically significant (P>0.05).Conclusion Except for "maliciously teasing", the report rate of other 5 kinds of bullying behaviors among urban secondary school students in Liaoning province have generally increased, especially the " threatened/intimidated " of boys.