为在保险费率调整实践中著名的平行四边形方法建立了严格的数学模型,提出了修正平行四边形方法和更一般的三角形方法,其皆可被看成是费率厘定的新工具。 A rigorous mathematical model was established for the well-known parallelogram method in the insurance premium adjustment practice, and the method of modifying the parallelogram and the more general triangle method were proposed, all of which could be considered as new tools for rate determination.