This machine is flat pan single-needle zigzag stitch sewing machine(with switch funcion of 2-position and 4-position). It is suitable for the sewing process of the garments such as skin-tight waistband,short pants and swimming suit.It can sew to the end without stopping,improbing the working efficiency;besides,it can also prevent the elastic of the waistband from generating slanting wrinkle and trans-position,and expand operation space.It can sew with the strap with a width of 50mm and sew the skin-tight panties.Through simple switch of the button pole,it can have 2 position and 4-position zigzag stitch on the same machine,greatly improbing the efficiency of the sewing machine.