以往的人力系统模型一般注重于职务等级、职龄或年龄的单一因素的描述．本文用分层控制的方法建立了等级制人力系统的三维稳定结构模型，它是职级、职龄和年龄三因素的联合分布．这些模型成功地被应用到了实际工程的设计中．

The older models of manpower system trend to describe the single factor of rank,service length or age.In this paper, using the method of controlling in layers,we established 3-dimension steady-state structrues for hierarchical manpower systems,which are the joint distributions of multidimension.These models are used successfully in designs of actual projects.