A fixing unit, an electro-photographic image forming apparatus having the same, and a printing method thereof are provided. The electro-photographic image forming apparatus includes a printing unit that forms a toner image on a recording medium by an electro-photographic method, a heat roller, a first pressure roller that faces the heat roller and forms a first fixing nip therebetween, one or more second pressure rollers that face the heat roller and form a second fixing nip therebetween, and a guide member that changes its position to a first position for guiding the recoding medium to the second fixing nip after the recording medium passes through the first fixing nip or to a second position for blocking the recording medium from moving to the second fixing nip after the recording medium passes through the first fixing nip.