Nano-zinc　ferrites,　prepared　by　co-precipitation　method　from　iron(III)　chloride　hexahydrate　and　zinc　sulfate　with　sodium　hydroxide　as　precipitation　agent,　were　characterized　by　TG-DTA,　XRD,　TEM,　and　FT-IR.　The　results　indicated　that　zinc　ferrites　with　better　spine-type　structure　were　obtained　after　calcining　the　zinc　ferrites　precursors　prepared　by　co-precipitation　at　800　°C　sintering　temperature.　The　degradation　of　rhodamine　B　(RhB)　in　aqueous　solution　was　conducted　using　ZnFe204　as　photo-catalyst　under　iodine-tungsten　lamp　irradiation.　Results　proved　that　the　photocatalytic　activity　was　excellent　at　0.　1　g/L,　and　the　degradation　rates　of　RhB　could　be　up　to　86.　2%.