Spring is an important part of the oil seal. It is very important to accurately predict the radial force generated by springs for the design and selection of oil seal springs.Analysis and calculation model of the spring radial force was established by using MATLAB software. By using the model, the spring radial force can be estimated and the spring length required for a particular radial force can be calculated.User interface was designed, and the software that could be run independently was generated; the correctness of the software calculation results was verified by using the radial force measurement instrument. It provides a convenient and quick analysis tool for the design and selection of oil seal springs