Abstract: This paper summarizes nine principles of CAD aeroengine pipe routing and considers three approaches of CAD pipe routing.According to the complexity of aeroengine pipeline system and the features of computer aided routing,WRS(Wide in diameter,Region,Stride) approach is provided,that is first to route tubes Wide in diameter,then in dividing Region,last tubes of Striding regions.The approach conforms to rules of routing from wide in diameter to narrow,from short in length to long,from difficult in layout to easy.It bases on the principle that optimization in local region can reach to overall optimization of pipeline system.Considering the feature of 3D view for computer aided pipe routing,the WRS method avoids exchanging between the overall view and local view in the electronic engine mockup ,especially routing in dividing region.A pipeline system layout was successfully made on an electronic mockup by using the WRS approach.It is proven that the WRS method can gain success for only once,and shorten the period of design.The presented method is useful to aeroengine pipeline system design.