Alginate Methacryloyl (AlgMA) (MW 300000) is a methacryloyl-modified alginate known for its potential use in tissue engineering scaffolds and 3D printing inks. This compound exhibits biocompatibility, non-immunogenicity, and low toxicity, and can physically crosslink with divalent cations such as calcium. Under the influence of photoinitiator LAP, AlgMA self-assembles into fibrous hydrogels, targeting bioactive adhesion sites to provide inherent support to tissue cells and facilitate biodegradation. It is applicable in fields such as cell culture, biological 3D printing, and tissue engineering.