A continuous hot rolling method comprising the steps of: cutting the tail portion of a preceding material in a steel product and the front portion of a succeeding material in the steel product to form butt faces; previously determining the thickness of scale created on the butt faces to determine the proportion of the weight of the scale; calculating the amount of oxygen dissolved in a weld molten zone, determining a deoxidation capacity of a deoxidizer for deoxidizing the above amount of oxygen; allowing the butt faces to abut against each other to form a butt area; applying a laser beam to the butt area to form a weld molten zone; incorporating the deoxidizer having the above deoxidation capacity into the weld molten zone; and hot rolling the molten joined steel product. <IMAGE>
