The invention discloses a dual modulation coding method which comprises the following steps of: (A) carrying out run length limit (RLL) (d, k) or order-M RLL (d, k) modulation coding on binary data, wherein in the modulation coding, the value of the parameter d is reduced and/or the value of the parameter k is increased; and (B) carrying out order modulation on the data subjected to the modulation coding of the step (A) to generate a run sequence or an order sequence. In the invention, high-code-rate modulation coding can be realized through reducing the valve of the parameter d and/or increasing the value of the parameter k so as to improve the recording density of a digital video disc and increase the memory capacity.