| The draping-down door which is one kind of all docks is mainly bulit in dry docks. In recent years, many draping-down doors have been bulit successfully with the dock construction. The door is made to falls down or gets up by compressed air of operating cabin. At present,its is designed according to the theory of statis balance and relate criterion. However, because of many factors affect its movement, such as wind, wave.,the analysis whether the door moves badly or stablely is merely depent on physical model.This paper is based on the summing-up of the development and researches of its experimentation and the current theories and the complementarity about pneumatic control double-sided gate of dry dock. the programs is done to ask for this theroy answer ,including the choice of parameter and coefficiente , program debug and answer analysis. Fanally from the program, the rising- and -falliingcurve about the door can be gained. In addition, AutoCAD was used in VB 6.0, which is easy to gain parameters from graphics. Interface can been made through VB computer language to get more data directely and simulate the rising- and- falling process. The computed datas are compared with testing datas and their result is given to confirm the software usability. Once the software succeds , it will provide the reference of the door design and make the dock-moving process safely.The software aims to solve the problems that is diffcult to been taken into account. In addition, At present no corresponding practical project software, was developed to satisfy the necessity of the project of dock gate. In other word, It is imperative to develop programming module and carry through more scholastic pursuit about it.
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