Chalmers' distinction between 'easy problems' and 'difficult problems' in consciousness research is a major advancement in consciousness research. However, he did not find a solution to the 'difficult problem'. The solution of the 'difficult problem' of consciousness must break out of the rigid logical thinking mode, and treat the 'difficult problem' of consciousness with the dialectical nature of consciousness itself and a broader scope. Because the 'difficult problem' of consciousness research is no longer a problem within the scope of biology or physical chemistry, reducing the problem of consciousness to a problem of physical chemistry does not help the problem of consciousness. The process of consciousness is not only the process of biological chemistry, but also the process of animal life. The process of consciousness has the duality of biological characteristics and animal life characteristics, and it needs to be based on the existence of animal life. The duality of sensation is the embodiment of the duality of the consciousness process.