This paper mainly narrates the concepts of object-oriented method and design pattern,with a concrete project—the work schedule module design demonstrates the factory method and state pattern used in the project.

In DCS(Distributed Control System) the main control software is very important,so in order to improve it s stability extensibility and universality,a universal layered model was established with design patterns such as the state machine,MVC(Model View and Controller),state pattern and so on.

The basic conception of the state pattern is introduced in this paper,explain the relationship between state and procedure,and discuss the application of state pattern in the state-machine of workflow,and also give a concrete example at last.

Based on the human behaviour modes, namely order mode, mobile mode, display mode and status mode, the article discusses the relevant areas of interior design and illustrates the close relationship between the human behaviour and interior space design.

The principle and progress of stress sag automation management is discussed,especially the link of spatial ad attribute data of geographic information system,the efficient critical span decision,and the arithmetic of power transmission line state equation are expatiated.

The inclined parabola state equation of overhead line is a common computing formula in wire stress and sag calculation, but its induced method by using the line length formula is very complicated.