Abstract: In order to approach the effect of different source Fe on piglet's growth, metabolism and environment,an experiment was conducted with 158 suckling pigs from 15 litters,which were randomly allocated to group Ⅰ,Ⅱ and Ⅲ,and fed with diet Ⅰ(basal diet+FeSO₄·H₂O),Ⅱ(basal diet+Fe-citric acid)and Ⅲ(basal diet+Fe-methionine complex),respectively.Each of the diets contained 146mg·kg^-1 Fe.The results show that after the experiment ended, the body weight,daily increment,grades for appearance and behavior,hemoglobin concentration in blood, Fe transferring albumen concentration in plasma,and Fe contents in plasma and liver of 35 days old piglets in group Ⅱ and Ⅲ were higher(P<0.05 or P<0.01)than those in group Ⅰ,while the feed conversion,diarrhea incidence, fecal amount and its Fe content of the piglets in group Ⅱ and Ⅲ were lower (P<0.05 or P<0.01) than those in group Ⅰ.The body weight and daily gain of the piglets in group Ⅲ were also higher (P<0.05) than those in group Ⅱ, but no significant differences (P>0.05) in other traits between group Ⅱ and Ⅲ. It is suggested that Fe-methionine complex and Fe citric acid could improve piglet's health,growth and development,feed conversion,and physiological and biochemical parameters,increase the absorption and utilization of Fe by piglet's body,and decrease the fecal amount and its Fe content.Both of them should be effective and safe Fe sources for suckling pigs.