应用算法建立模型并编写程序，实现对系统原始函数的识别。程序为对一四阶传递函数的识别，通过修改扫描频率可获得不同趋近原始系统的传递函数。-Applied algorithm model and program, realize the original function of system identification. Procedures for the transfer function of matters order by modifying scan frequency identification, can obtain different approach to the transfer function of the original system.