Nano　zerovalent　iron　particles　coated　with　biopolymer　nanoskin　were　prepared　by　liquid　phase　method.　For　a　period　of　time,　the　remaining　xanthan　layer　can　prevent　oxidation　of　nano　iron　in　air.　The　goal　of　this　study　is　to　demonstrate　that　magnetic　properties　of　magnetic　fluid　which　suspend　nano　iron　particles　coated　with　xanthan　in　xanthan/guar　fluid.　Magnetic　hysteresis　loops　were　measured　at　room　temperatures　and　field-cooled/zero-field-cooled　magnetization　curves　were　obtained　at　low　temperature　by　a　vibrating　sample　magnetometer.　The　results　interpret　that　biopolymer　nano　skin　did　not　strongly　weaken　the　magnetic　interaction　between　nano　iron　particles.　©　(2014)　Trans　Tech　Publications,　Switzerland.