Abstract: The train diagram which was drawn up by using artificial simulation method, could meet the design requirements of train numbers for each time period, satisfy the train reverse constraint with virtual link and adjustment. According to the situation of train in-out stock, the diagram was adjusted further to meet the needs of designers. Different full-time train operation plan to different line could be drawn. At the same time, the train diagram could be translated into CAD script, the labour intensity could be reduced greatly. Finally Line 6 of Shenzhen Metro was taken as an example to implement the drawing of train diagram, show the method feasibility and effectiveness.