Negotiorumgestiosystemisalong-standinglegalsystem,bythethousandsofyearsofdevelopment,inthecontinentallawsystemcountrieshaveestablishedacompletesystem.TheresearchfornegotiorumgestiosysteminChinaisless,systemisnotcomprehensive,needtoacceleratethepaceoflegislationtheoryresearch.AndintheAnglo-Americanlawsystemisnotexactlythesamesystemwithnegotiorumgestiosystem,butquasicontractsystemofAnglo-Americanlawsystemcoversthecontentsofnegotiorumgestio.Soonthebasisofnegotiorumgestioisdiscussedsometheory,andthequasicontractsystemtodoalittlemore.Thisarticleisdividedintothefollowingseveralparts,thefirstpartfromthehistory,concept,nature,valueandstatusinthispaperintroducesthebasicsituationofnegotiorumgestio.Thesecondpartdiscussestheconditionofnegotiorumgestio.ThethirdpartandthefourthpartintroducesthequasicontractsystemofAnglo-Americanlawsystemandcompareitwithnegotiorumgestiomadesome.Toimprovethecountry'sbestnegotiorumgestiosystemputsforwardsomeSuggestions.