Abstract: Preparation of nano-sized zinc subcarbonate with a microreactor and by zinc sulfate and ammonium bicarbonate as raw materials was researched.Effects of the operation conditions,such as concentration,flow rate,and temperature,on the product particle specific surface area and crystal morphology were investigated.Results showed that nano-sized zinc subcarbonate looking like ellipsoid petal,with narrow particle size distribution and with the specific surface area of 60.90 m<SUP>2</SUP>/g,was prepared under the optimum conditions:concentration of zinc sulphate was 0.5 mol/L;flow rate was 10 L/h;and reaction temperature was 50 ℃.<BR>