Abstract: To achieve the morphology-controllable synthesis of nano Fe₃O₄/polypyrrole(PPy) composites,nano Fe₃O₄/PPy composites were synthesized through emulsion polymerization method in the presence of sodium dodecyl benzene sulfonate (NaDBS) surfactant. The effects of usage of oil phase pyrrole and surfactant on surface morphology of nano Fe₃O₄/PPy composites were discussed. The relationship between morphology and conductive-magnetic properties of nano Fe₃O₄/PPy composites was analyzed.The results show that the morphology of nano Fe₃O₄/PPy composites can be changed from strawberry-like structure to core-shell structure through increasing the amount of pyrrole, and the amount of the micelles changes with the usage variation of the surfactant, according to which can achieve the controllable adjust of the quantity of cores to get the core-shell structure nano Fe₃O₄/PPy composites with single core or multiple cores.