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本文采用系统工程方法，对现有双代号、单代号和搭接网络图做了全面深入分析，确认它们都存在严重缺陷，已不能满足项目实施的客观需要，其大部分使用价值已经失去．经全面系统地研究，提出了“工艺参数型工作”、“空间参数型工作”和“时间参数型工作”等新概念，首次建立了三维网络图基本模式．该模式具有构图科学、计算简捷和适用性强等特点．
This paper adopts the system engineering method and makes a thorough and in-depth analysis of the existing dual-code, single-code and lapped network diagrams. It is confirmed that they all have serious defects and can no longer meet the objective needs of project implementation. Most of their use value has been lost. After a comprehensive and systematic study, new concepts such as “process parameter type work”, “spatial parameter type work” and “time parameter work” were proposed, and the basic pattern of three-dimensional network map was established for the first time. This model has the characteristics of composition science, simple calculation and strong applicability.