The Manning Formula is an empirical formula calculating the channel flow or speed.The Civil 3D software uses a custom tag expression to link the Manning Formula to a certain tag, so that the Manning Formula is able to be seen the gains, same as the the basic data of pipe network parts.Based on a practical project case study, this paper applies the software of AutoCAD Civil 3D to label the pipeline network in plane to show its flow value.Results shows that the AutoCAD Civil 3D possesses great advantages in applying the Manning Formula to optimize pipe network design and check parts in pipeline network parts.

The Zhangjiajie West Railway Station of Qianzhangchang Railway is designed with the concept that beautiful mountains are continuous and lush, covering bridges stretching for hundreds of miles. This paper introduces the BIM application in the Zhangjiajie West Railway Station, which provides effective guarantee for the smooth progress of the project in terms of steel structure deepening, steel grid lifting calculation, internal and external installation deepening, collision inspection, and etc. This application has great practicability, and provides valuable experience for the company's BIM Technology Application in similar construction projects and the creation of "Luban Award" for projects.