Abstract: The non-oriented electrical steel has the advantages of high magnetic induction and energy conservation via thin slab casting and rolling(TSCR),but it usually appears layers upon the edge of steel strip.Mechanism of the edge layer had been investigated,in order to improve edge quality and product yield as well.The used strip is TGW600,which is produced by TCSR in Tang Steel.The influencing factors of the edge defect are researched,including the reason of intermediate slab fold,simulating deformation in grains,high temperature strength and its comparison with other grades,as well as expansion curves.It is found out that the uneven deformation of grains at rolling direction and cross direction contributes to the edge layer,there is unobvious phase process,and the microstructure is ferrite at the test temperature window,therefore,there is no ductility trough.It is suggested that solutions to this defect are promoting recrystallization and controlling the shape of strip during hot rolling.