An image forming method including applying a treatment liquid; and applying a first ink containing a pigment, water, and polymer particles of with the content is 1.0 mass % to 3.0 mass %, and applying a second ink having a different hue to the first ink onto the applied first ink at an ink droplet speed of 6 m/sec to 10 m/sec to form a multi-color image, in which an interval from a landing time point of the first ink to a landing time point of the second ink is 200 msec or less, and a dot diameter φ2 of the second ink, and a dot diameter φ1 of the second ink in an ink droplet amount equal to an ink droplet amount in the forming of the multi-color image satisfy a relationship of 0.90≦φ2/φ1≦1.10.