ObjectiveAccurately　identifying　the　intensity　difference,　variation　trend　and　inter-annual　variation　of　forest　pest　disasters　in　different　periods　in　China　is　the　premise　for　formulating　effective　forest　pest　disaster　response　strategies　and　implementing　differentiated　fiscal　subsidy　policies.　It　is　of　great　significance　to　prevent　forestry　disaster　risk,　improve　the　risk　control　level　of　forest　resources　and　enhance　the　supply　capacity　of　forestry　carbon　sink.　Method　The　numerical　analysis　method　was　used　to　analyze　the　general　occurance　of　forest　biohazards　with　the　statistical　data　of　forest　biohazards　from　1998　to　2018.　According　to　the　variation　values　of　the　incidence　of　forest　diseases,　insect　pests　and　rodent　disasters　in　China　from　1998　to　2018,　the　interannual　changes　of　the　intensity　of　various　disasters　were　analyzed.　The　grey　correlation　degree　method　was　further　used　to　determine　the　correlation　degree　of　forest　diseases,　insect　pests　and　rodents　in　forestry　pest　disasters　and　the　weight　of　their　impact　on　forest　resources,　and　hence　to　determine　the　comprehensive　index　of　forest　pest　disasters　in　China　from　1998　to　2018.　Finally,　the　comprehensive　grade　of　forest　pest　disasters　in　China　in　the　above　period　was　divided.　Result1)　From　1998　to　2018,　insect　pests　was　the　main　forest　pest　disaster　in　China,　followed　by　disease　and　rodent.　However,　the　increase　of　the　area　of　rodents　infestation　was　larger　than　that　of　diseases　and　insect　pests.　Compared　with　1998,　the　growth　rate　of　the　area　affected　by　rodents,　diseases　and　insect　pests　in　2018　increased　by　156.　36,　83.　09　and　57.　72　percentage　points,　respectively.　2)　The　intensity　of　all　kinds　of　forest　pest　disasters　was　different　in　different　years.　In　the　study　period,　2007　was　the　year　with　the　highest　occurrence　intensity　of　forest　pests　and　rodents,　while　2018　was　the　year　with　the　highest　occurrence　intensity　of　forest　diseases.　3)　According　to　the　comprehensive　disaster　index　of　forest　pests　from　1998　to　2018,　the　forest　pest　disaster　in　China　from　1998　to　2018　can　be　divided　into　three　stages.　The　first　stage　was　from　1998　to　2005,　during　which　the　comprehensive　disaster　level　of　forest　pest　was　the　lowest,　and　the　harm　of　forest　pest　to　forest　resources　was　the　least.　The　second　stage　was　from　2006　to　2008,　during　which　the　forest　pest　caused　the　most　serious　damage　to　forest　resources,　and　the　comprehensive　disaster　grade　was　the　highest,　especially　in　2007.　The　third　stage　was　from　2009　to　2018.　In　this　stage,　the　comprehensive　level　of　disaster　to　some　extent　decreased,　but　the　overall　degree　of　disaster　was　still　relatively　serious.　ConclusionFrom　1998　to　2018,　the　total　area　of　forestry　pest　disasters　in　China　is　on　increase.　Among　them,　the　mild　disasters　account　for　the　majority,　but　their　area　is　increasing　year　by　year,　while　the　area　and　incidence　of　moderate　and　severe　disasters　fluctuate　and　decrease.　The　annual　area　of　forest　insect　pests　is　relatively　serious,　and　the　area　of　rodent　pests　is　increasing　rapidly.　At　present,　forest　disasters　have　reached　the　highest　disaster　intensity　in　the　research　period.　In　addition,　although　the　comprehensive　level　of　forest　pest　disaster　has　declined,　it　is　still　at　a　relatively　high　level,　and　the　area　of　pest　disasters　is　increasing　year　by　year,　and　the　prevention　and　control　situation　is　still　serious.　It　may　be　effective　to　maintain　the　ecological　security　and　promote　the　construction　of　ecological　civilization　in　China　by　adopting　differentiated　forest　disaster　response　measures,　focusing　on　curbing　the　rapid　growth　trend　of　forest　rodent　pests,　reducing　the　incidence　of　forest　insect　pests　and　strengthening　the　prevention　and　control　of　severe　diseases.　©　2022　Chinese　Society　of　Forestry.　All　rights　reserved.