Abstract: Aiming at the support parameter design of rectangular roadway in coal mine, fuzzy mathematics is used to analyze the stability categories of surrounding rock of coal roadway.Seven indexes, including roof rock uniaxial compressive strength, floor rock uniaxial compressive strength, coal seam uniaxial compressive strength, tunnel buried depth, mining influence coefficient, pillar width and surrounding rock integrity, were selected as the stability analysis indexes of rectangular roadway surrounding rock, and different support forms were selected according to the different stability types of surrounding rock.Suspension theory support design method is used to design, and reasonable support parameters are calculated, and a reasonable support scheme is automatically selected by judging similar sample data from many samples in the database.With Visual Studio 2022 as the development tool and SQL Sever 2019,the roadway information database of surrounding rock mechanical parameters, supporting parameters, surrounding rock stability and other information was built.The computer programming was carried out in C# language to realize the functions of roadway parameter database management, surrounding rock stability classification, intelligent design of supporting parameters and so on.