Soil chemical and biological properties for coordination fishricereedcattail husbandry in suda salineCDalkaline land of Songnen Plain was studied from 1998 to 2002. The results show that soil pH and salinity decrease by 8.17% and 43.57% respectively at after exploited in fishery,organic matter,total N,total P,total K and available N,available P,available K is big increase than that of before exploited,CEC and exchangeable basa increase by 821% and 27.71% respectively. Soil microorganisms of paddy field, reed pond and cattail pond increase by 10.0, 19 and 2.3 times respectively, and soil enzyme activity increase than that of before exploited. The humus of soil take the fulvic acid as the dominant factor, the increas rate of HA/FA value is 21.08%-52.33%. The dedicate rate of salinealkaline washing by drain away water is about 80% on decreasing consentration of salinity in soil. The dedicate rate of absorption by rice straw, reed and cattail is about 10% on decreasing consentration of salinity in soil. Salinity and alkalinity of the wastewater in ecoagriculture pattern of fishricereedcattail decrease at 1.07-1.19g/L and 7.07-10.13 mmol/L, respectively.