A dyeing method for raising a blue color is provided. The method includes dyeing fabric with raw dye, ferro-mordanting the fabric having undergone the dyeing of raw dye with ferro-mordant, producing potassium ferrocyanide solution by dissolving potassium ferrocyanide in water, and putting the fabric having undergone the ferro-mordanting into the solution obtained in the potassium ferrocyanide solution production and then ripening the fabric until a blue color of a desired tone is raised. Accordingly, a stabilized dyeing state of blue color group is easily got even using natural dyeing materials as material difficult to raise a blue color on fabric.