According to the characteristic of CFRF, we develop the calculation method of postfix form that can reduce calling CFL sentence parsing and redundant evaluation to improve the efficiency.

• 根据CFRF的特点，提出了后缀形式的计算方法，减少在函数计算中存在的动态语法分析，避免了不必要的求值计算，使效率得到提高。