In order to solve the problem of low degree automation in the design of pipelines and equipment during the aircraft development process, the secondary development based on CATIA V5 was carried out, and the related tools were built by using API interface and VB language. And mainly carrying out research in the following aspects. Firstly, the rapid layout of equipment was carried out in the preliminary design stage of the aircraft. Secondly, based on the spatial arrangement of electrical equipment and surrounding parts, a single DMU tube line channel topology was carried out. According to the definition of EWIS isolation code, the type of wiring harness channel was planned, the physical isolation distance between the channels was analyzed automatically. According to the EWIS isolation requirement specification and the automatically analyzed physical isolation distance, the results of clearance inspection and analysis report between the lines and channels of the whole machine were output so as to provide corresponding interfaces and design specifications for subsequent channel topology optimization. Thirdly, the main channel and branch channel topology were carried out. By defining the diameter of the channel, the specifications of the cables arranged in the channel and the probability of different types of wiring, the development tool automatically calculated the total length of the EWIS cables and quickly calculated the weight of the cable laying scheme by the formula, which can be referred for the whole aircraft design.