Disclosed are a plant type related protein, and a coding gene and an application thereof. The protein provided in the present invention is the following (a) or (b) or (c): (a) a protein consisting of an amino acid sequence shown in sequence 1; (b) a sequence 1 derived protein by performing substitution and/or deletion and/or addition of an amino acid residue on the sequence 1, and related to the plant type and/or inactivation of a plant brassinolide type, and (c) a protein having a more than 80％ homology and related to a plant type and inactivation of a plant brassinolide type. The protein and the coding gene thereof provided in the present invention have very important value in improving the production of a crop, improving the visual enjoyability of a green plant, implementing simple cultivation of a plant and improving the breeding efficiency, and has a broad prospective in genetic improvement of a plant, new variety cultivation and an application.
