图上可直接展示施工进度网络计划的各时间参数，特别是各工作的总时差和自由时差。

The each time parameter of construction schedule network planning in the graph may be exposed immediately, the total float and the free float of each work especially.

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工作的总时差是工作的最主要时间参数之一，是网络图中关键工作和关键线路的判别依据。

The total float time is one of the important time parameters for a working task, and also is the basis for ascertaining critical work and critical paths in network planning.

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工作总时差是工作最主要的基本时间参数之一，其大小是网络图中关键工作和关键线路的判别依据。

The basic principle of total time difference is analyzed, and a new thought of weight earned value is put forward.

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