AnalyzethesituationofviolenceriskfactorsKeywords:violence;riskfactorsTheviolenceisaprominentprobleminthedevelopmentofmodernsociety,causingwidespreadconcerninsocietyasawhole,athomeandabroadinrecentyearscarriedoutmanystudiesontheriskfactorsofviolence,thispaperintendstoresearchinthisareastatusquoarereviewed.1BiologicalFactors1.1braindamageforalongtimebeenanumberofstudiesthatfoundaspecificareaof​​thebraininjurycausesviolence.Veteransforheadinjuryresearchfoundthatfrontallobedamageandattackbehaviorrelationship.Grafman[1]onTheveteransofthe279casesofheadpenetratinginjurycontrolstudy,resultsshowedthatregardlessofthesizeoftheviolenceandtheinjuredarea,frontallobedamageindividualsshowedmoreattacksandviolence.Brower[2]summarizestheliteraturefoundthatbraininjuryrelatedtotheattackcontroldisorder,especiallyfrontallobedamage,thatrelatedtotheincreaseofthefrontallobedysfunctionand1aggression,defectsofthefrontallobeexecutivefunctionmaybetheincreasedoccurrenceoffutureattacks.recentyears,scholarsbelievethattheprefrontalcortexistocontroltheiremotionsneuralcircuitsimportantpartofthefrontallobedamagemaycauseemotionalcontroldisorder,theindividualtendstooccurviolencebutsofarnostudycanbereliablyprovefrontallobedysfunctioncanpredictviolence.1.2Brainimagingstudiesbrainimagingstudieshavefoundthatviolentcrimeandtheamountoftemporallobedysfunctionorstructuraldefects.Raineetal[3]measuredwithpositronemissiontomography(PET)perpetratorsofviolenceonbothsidesofthehemisphereforeheadandsubcorticalregions(amygdala,thebrain,thehippocampusandhypothalamus)function,reduceimpulsivehomicidalbehaviorforehead,rightsubcorticalregionenhancements,premeditatedhomicideactorsbutonlyincreasedactivityintherightsubcorticaldefectsdueforeheadfunction,theresultsofthisstudysupporttheimpulsivehomicidalbehavior,thehypothesiscannotcontroltheaggressiveimpulsesofsubcorticalregionsotherhumanPETstudiesalsofoundthathomicideand2violence,theformerfrontalcortexglucosemetabolismdecreasedaggressivebehaviorinpersonalitydisorderorbitofrontalcortexsugarbyloweringthereafterRaine[4]ofmagneticresonanceimaging(MRI)studyreportedviolence,antisocialpersonalitydisorderandhealthycomparedwithothermentaldisorders,theprefrontalgraymattersignificantlyreduceadecreaseof11%,comparedwiththehealthycontrolgroup,nosignificantchangesinthewhitematter.Soderstrom[5]singlephotonemissioncomputed(SPECT)scansandMRIon21patientswithimpulsiveviolentcriminalsweremeasuredstudyof16casesthetemporallobeand/orfrontalperfusionreduced,and11healthycontrols.Incomparison,theviolentgroupontherightangulargyrus,rightmiddletemporallobegyrus,bilateralhippocampusandtheleftfrontalwhitematterbloodflowissignificantlyreduced,whilebilateralparietalcortexbloodflowincreases,MRInostructuralchangespromptabnormalfrontalortemporallobeactivitymayberelatedtotheviolence.Somescholarsbelievethattheincreaseinviolenceforeheadfunctiondecreasedandsubcortical(includingtheamygdala),separatefrontal3lobedamagecannotexplaintheaggressivebehavior,youshouldconsidertheotherpartoftheneuralcircuitdysfunctionandpsychosocialfunctionaldefectsinteraction,sothequantitativeanalysisofcorticalandsubcorticalbrainregionsforfutureresearchdirections.1.3neuropsychologicaltestssomeresearchersuseindividualneuropsychologicaltestsassessviolencewhetherabnormalbrainfunctionYeudall[6]summarizesHRneuropsychologicalbatteryoftestsconduc...