Silver carp and blg-head carp swim so fast in open waters that it is difficult tocatch thom by means of the traditional trawl net. It is the reason why trawl net hasrarely been used in freshwater fishing. During 1982--1983, a new kind of four panelfrawl net with large-mesh was designed and tested in two large reservoirs in differentseasons. It was proved that the new designed trawl net can be used for catching silvercarp and bighead carp effectively and the fish below the catcheble size, can, escapethrough the meshes. The result indicates thaet the large-mesh trawl net has severaladvantages, such as simpler in net structrre, lighter in weight, lower in cost,increasein catches and easier in operating.