Abstract: The capture effects of different in-furnace additives on Zn,Cu,Pb,Cd and Cr were studied during municipal solid waste（MSW） incineration.Atomic absorption spectrometer（AAS） and scanning electron microscope-energy dispersive spectroscopy（SEM-EDS） were used to detect the distribution of heavy metals in bottom ash and ash surface and to observe the surface morphology.The results show that: the bottom ash presents various surface morphologies which consist mainly of acicular,flake and particle structure and very few of melt.Mixed acids of HCl/HNO3/HF/ HClO4 instead of aqua regia can be used for the digestion of bottom ash.The volatility of 5 heavy metals follows the sequence of Pb＞Cd＞ Cu＞Cr＞Zn in the additives-free case and the existence of Si can reduce the volatile of Zn significantly.Zeolite and limestone show a certain capture efficiency of Zn and Cr while brick and glass powder show a good capture efficiency of Zn and Cu,but kaolinite shows no capture effect.Si-Al atomic ratio of 3:1 in waste components is the best ratio to reduce heavy metals volatility.