Abstract: The beak of Dosidicus gigas is a feeding organ, which is completely composed of organic matter. The rostrum of the beak has a strong hardness and mechanical strength. The mechanical strength shows a significant gradient change, gradually decreasing from the rostrum to the wing. And the degree of pigmentation is gradually becoming shallower. Inspired by the gradient of the mechanical properties of stalk squid, we used chitosan, dopa, sodium periodate and other organic materials to construct materials that showed similar mechanical properties to the keratin. The materials can eliminate the interface, and their mechanical properties are spatially variable.