An image forming system, comprising: a sheet conveyance unit which conveys continuous paper; an image forming unit which forms an image on the continuous paper; a fixing unit which fixes the image formed on the continuous paper; and a controller which controls an image forming operation performed by the sheet conveyance unit, the image forming unit and the fixing unit, wherein in a case where a waste paper reduction mode is selected, the controller controls the sheet conveyance unit to stop conveying the continuous paper so that a bottom end of a last image on the continuous paper be at a second stop position on an upper-stream side of a first stop position after the bottom end of the last image passes the fixing unit when ending the image forming operation, and in a case where the waste paper reduction mode is not selected, the controller controls the sheet conveyance unit to stop conveying the continuous paper so that the bottom end of the last image on the continuous paper be at the first stop position after the bottom end of the last image passes the fixing unit when ending the image forming operation, wherein the image forming system further comprises: an image forming apparatus including the image forming unit and the fixing unit; and a roll-up apparatus which is disposed away from the image forming apparatus and which rolls up the continuous paper around a supporting shaft, the image being formed on the continuous paper by the image forming apparatus, characterized in that the first stop position is a position where the bottom end of the last image on the continuous paper is rolled up around the supporting shaft of the roll-up apparatus, and the second stop position is a position between the image forming apparatus and the roll-up apparatus. a sheet conveyance unit which conveys continuous paper; an image forming unit which forms an image on the continuous paper; a fixing unit which fixes the image formed on the continuous paper; and a controller which controls an image forming operation performed by the sheet conveyance unit, the image forming unit and the fixing unit, wherein in a case where a waste paper reduction mode is selected, the controller controls the sheet conveyance unit to stop conveying the continuous paper so that a bottom end of a last image on the continuous paper be at a second stop position on an upper-stream side of a first stop position after the bottom end of the last image passes the fixing unit when ending the image forming operation, and in a case where the waste paper reduction mode is not selected, the controller controls the sheet conveyance unit to stop conveying the continuous paper so that the bottom end of the last image on the continuous paper be at the first stop position after the bottom end of the last image passes the fixing unit when ending the image forming operation, wherein the image forming system further comprises: an image forming apparatus including the image forming unit and the fixing unit; and a roll-up apparatus which is disposed away from the image forming apparatus and which rolls up the continuous paper around a supporting shaft, the image being formed on the continuous paper by the image forming apparatus, characterized in that the first stop position is a position where the bottom end of the last image on the continuous paper is rolled up around the supporting shaft of the roll-up apparatus, and an image forming apparatus including the image forming unit and the fixing unit; and a roll-up apparatus which is disposed away from the image forming apparatus and which rolls up the continuous paper around a supporting shaft, the image being formed on the continuous paper by the image forming apparatus, characterized in that the first stop position is a position where the bottom end of the last image on the continuous paper is rolled up around the supporting shaft of the roll-up apparatus, and the second stop position is a position between the image forming apparatus and the roll-up apparatus.