Model design  model design using the model to carry on the design idea and design scheme. Model design contents include (1) set} f a general model using the model has the characteristics of vertical Hugh image intuitive, the industry area, factory on the overall layout in conception. Using the model fully show u meter area where the spatial relations between the relevant facilities, and can more scheme comparison, make a few perfect reasonable overall design become ". (2) models of equipment layout design: the main is _ process installation design professionals in the preliminary design stage, model was used to design conception, make equipment layout scheme, and can be a variety of soil case comparison, so as to improve the quality of the preliminary design. Effectively control the burning area and investment.