The problem of mutual interference and union between cable machines has greater influence on the schedule and quality of concrete dam pouring.The research on this problem is helpful for the simulation of concrete process as well as the better guidance of actual construction. By using the technology of spatial analysis and conflict recognition and combining with the reality,the paper proposed the simulation principles of concrete-dam pouring in various conditions for handling the mutual interference and union of cable machines and set up the simulation model of high concrete dam construction. Combining with AutoCAD two times development platform ,the paper developed the simulation and visual system for concrete-dam pouring.The engineering application example shows that the rule and model proposed can simulate the dam pouring process accurately and has guidance significance for the construction of actual engineering.