The　structure　and　magnetic　properties　of　Ce0.04Tm2.96CrxFe5-xO12　(x　=　0-0.30)　prepared　via　sol-gel　route　were　studied　in　this　paper.　X-ray　diffraction　(XRD)　data　and　Raman　spectra　(RS)　data　revealed　that　Cr　and　Ce　strongly　enter　the　Tm3Fe5O12　(TmIG)　structure.　RS　results　showed　the　characteristic　peaks　of　TmIG　garnets　ferrites.　The　X-ray　photoelectron　spectroscopy　(XPS)　results　in　Ce0.04Tm2.96Cr0.25Fe4.75O12　revealed　that　single　valence　state　of　iron　was　＂+3.＂　Moreover,　by　comparing　Ce0.04Tm2.96Fe5O12　with　Cr-doped　sample,　saturation　magnetization　(M-s)　was　increased,　which　may　be　related　to　the　fact　that　Cr3+　ions　occupied　octahedral　position　(a)　to　increase　the　effective　moments　formed　by　Fe3+　cations.　The　M-s　of　the　sample　x　=　0.15　reaches　a　maximum　of　18.24　emu/g.　Furthermore,　these　nanoferrites　with　different　magnetic　properties　and　structures　may　be　used　for　longitudinal　recording　and　sensor　applications.