Chengta series software is based on Google earth COM API and latest BIM methodology,GIS technology with satellite picture, intelligent mobile phone, GPS, directly using Google earth on alignment design, elevation extraction, SRTM DEM download, CAD contour line drawing, satellite imaging downloading, existing ground profile creation, AutoCAD, KML (KMZ), import and export GPS or Excel file to Google earth, overlap the contour line with satellite images, etc. It can dramatically improve the work efficiency.