There are a large number of bronze collections in Shanxi Museum, and many of them have been seriously corroded under the effects of corrosion in burial environment. In order to provide scientific basis and data support for subsequent restoration and conservation, studies should be done to analyze corrosion conditions of these bronze wares. 21 ancient bronze collections were selected as samples, comprehensive analysis was made to corrosion products on the samples to define hazardous corrosion products with optical microscope, polarizing microscope and based upon Raman spectrum analysis. There were 5 kinds of superficial corrosion structures on the surface of this lot of bronze wares. Most of the green corrosion products were malachite and atacamite (major hazardous corrosion product), while some of them were botallackite and brochantite; red and blue corrosion products were cuprite and azurite, respectively. Most of malachite products on the surface of bronze wares are compact and harmless to bronzes, they can be preserved as they have protective effect on bronze wares by preventing copper from contacting air and moisture directly. Atacamite imposes risk of bronzes preservation and shall be completely removed during repair.