In　this　study,　an　innovative　Higee　hydraulic　oil　purification　device　capable　of　removing　the　solid　particle　contaminants　and　water　moisture　simultaneously　is　developed　for　dealing　with　the　contamination　control　problem　of　fluid　power　systems.　The　purification　device　is　considered　as　a　combination　of　two　units　(hydrocyclone　separator　and　rotating　packed　bed)　according　to　different　separation　functions.　The　mathematical　models　about　the　migration　regularity　and　dynamic　behavior　of　different　phases　have　been　established,　in　which　discrete　phase　model　model　is　employed　to　simulate　the　solid　particles　-　hydraulic　oil　separation,　and　Eulerian　model　is　selected　as　the　multiphase　simulation　model　to　simulate　the　hydraulic　oil　-　water　moisture　separation.　Simulation　results　demonstrate　that　the　hydrocyclone　separator　can　remove　solid　particles　of　5　to　15　mu　m,　while　the　rotating　packed　bed　can　mitigate　water　moisture.　The　results　indicate　that　the　developed　Higee　hydraulic　oil　purification　device　can　provide　an　effective　and　efficient　manner　for　controlling　the　contamination　level　of　fluid　power　systems.