Chemical forms and availabilities of soil Cu，Ni，Pb and Zn in Kunshan City of Jiangsu Province were studied. In terms of content soil Cu，Ni，Pb and Zn of various forms followed the order of residue form > organic-matter-bound form > Fe-Mn-oxide-bound forms > carbonate-bound form and exchangeable form. Residue form was obviously higher than the others in content. Of Cu and Pb，the organicmatterbound form accounted for a quite high proportion，being 3609% and 28.30% respectively. Among the heavy metals，Zn was the highest in exchangeable，carbonate-bound，Fe-Mn-oxide-bound and residue forms，and Cu was in organic-matter-bound form. Ni was the highest in variation coefficient of exchangeable，carbonate-bound and Fe-Mn-oxide-bound forms，Zn was of organic-matter-bound form，and Pb was of residue form. Among the various forms，Fe-Mn-oxide-bound Cu and soil exchangeable Cu showed the biggest impact on availability of soil Cu；exchangeable Ni did on availability of soil Ni；Fe-Mn-oxide-bound Pb and organic-matter-bound Pb did on availability of soil Pb；and exchangeable Zn and carbonate-bound Zn did on availability of soil Zn.