An image forming method includes the steps of: depositing an ink containing 10% or more and less than 30% of a water-soluble high-boiling-point organic solvent having an SP value of 28 or lower, onto a recording medium in accordance with an image signal, the ink having a viscosity of 10 cP or lower in a case where a temperature of the ink is 25° C.; removing water contained in the solvent of the ink on the recording medium, by a heating drying device; and heating and pressurizing the ink so as to fix the ink onto the recording medium.