The geological situation is complicated in Banchang polymetallic mining area. The fracture development of the upper part leads to the common occurrence of well leakage, collapse and shrinkage often occur because of strong water-sensitive of epidote and chlorite in middle formation. It is determined to use low solid plant glue drilling mud system in upper part; and the approximate adding amouts of plant glue, potassium humate and potassium polyacrylate as well as the influence on drilling mud performance are made clear by series of experiments; at the lower part, on the basis of plant glue, calcium treatment drilling mud was used to enhance the inhibition, increase adding amount of plant glue(CL) and asphalt powder(FT) in order to improve cementing ability and sealing ability of mud. The mud schemes have been succssefully applied in ZK1724 of Banchang polymentallic mining area, which created favorable conditions for complex formations in this area.