Home improvement design industry is an important piece in domestic construction field in China.Through the research work of this paper, we have established a BIM-based home improvement design software for the home decoration design industry.The paper briefly introduces the main functions of the software system, and then describes in details the algorithm design ideas of several main functions.Some screenshots of thesoftware operation interface are also shown in the paper to illustrate the function and effect of function realization in software implementation.The innovative application of the software will provide both the home improvement designers and the customers with brand new experience in home improvement, and promote the development of new pattern on the home decoration industry.