Abstract: The Fe -C mixed powder without low meltingpoint adhesive was sintered by selective laser sintering machine, and the effect of sintering parameters on sintering formation was studied. The relationship between sintering thickness with laser power, scan interval and scanning velocity were analyzed.The relation formula between scan interval and sintering thickness was established and was verified with experiment.The sintering mechanism and ballingphenomena were studied through microstructure.The complex metal part with comparative accuracy and density was obtained under reasonable sintering parameters.