In order to exploit rationally the saline-alkali marsh land in the Songliao Plain,we have conducted the experiments on the comprehensive fishery utilization of the saline-alkali marsh land in the Da’an City during 1990-1993,By means of the fish culture models of small natural saline-alkali rotation of fish and sheat, field and pond, rice field, reed swamps and fish-reed-rice have been established,This kind of land harnessing covered about 676.91 ha in 4 years. These models of exploitation have achieved remarkable bene-fits of economy, ecology and society, and the environment and the ecological balance were protected in this area.