Animal　husbandry　is　the　second　largest　source　of　steroid　estrogen　(SE)　pollutants　in　the　environment,　and　it　is　significant　to　investigate　the　occurrence　and　fate　of　SEs　discharged　from　concentrated　animal　feeding　operations.　In　this　research,　with　a　Chinese　typical　concentrated　dairy　farm　as　the　object,　the　concentrations　of　SEs　(E1,　17α-E2,　17β-E2,　E3,　and　E1-S3)　in　slurry,　lagoon　water,　and　slurry-irrigated　soil　samples　in　summer,　autumn,　and　winter　were　determined.　The　total　concentrations　of　SEs　(mainly　E1,　17α-E2,　and　17β-E2)　in　slurry　were　very　high　in　the　range　of　263.1-2475.08　ng·L-1.　In　the　lagoon　water,　the　removal　efficiencies　of　the　aerobic　tank　could　reach　up　to　89.53%,　with　significant　fluctuation　in　different　seasons.　In　the　slurry-irrigated　soil,　the　maximum　concentrations　of　SEs　in　the　topsoil　and　subsoil　were　21.54　ng·g-1　to　6.82　g·g-1,　respectively.　Most　of　the　SEs　tended　to　transport　downward　and　accumulate　in　the　soil　accompanied　with　the　complex　mutual　conversion.　Correlations　and　hierarchical　clustering　analysis　showed　a　variety　of　intertransformation　among　SEs,　and　the　concentrations　of　SEs　were　correlated　with　various　physicochemical　indexes,　such　as　TN　and　NO3-N　of　the　slurry,　chemical　oxygen　demand　of　the　lagoon　water,　and　the　heavy　metals　of　soil.　In　addition,　17β-estradiol　equivalency　assessment　and　risk　quotients　indicated　that　the　slurry　irrigation　and　discharge　of　the　lagoon　water　would　cause　potential　estrogenic　risks　to　the　environment.　Consequently,　reasonable　slurry　irrigation　and　lagoon　water　discharge　are　essential　to　efficiently　control　SE　pollution　in　the　environment.　©