Research methods: The geometry and algebra equation are used in the course of research combining with design experience in Shenyang Metro.
Research results: Through studying the correlative parameters of the metro design，this paper educes computing formula of the effective length，cross-over distance between the two lines and economical grade，and sets forth the influence of structure delimitation，track style，signal system on the design of line.
Research Conclusions: The studying of calculational method explains the close relations of metro line，track and signal. The different designs depend on different parameters. We need comparison and choice of different plans，so reasonal line plans will be attained.
2007, Vol. 24 
