Abstract：
Terminal T3B Project at Beijing Capital International Airport has a large construction site and complicated architectural shape with many curves. Due to the far distance of the boundary piles or control points, it is difficult to lead them to near the building by three-point survey. It is required that the axes of the building under construction 2 km apart should be kept in a line. Moreover, several contractors are undertaking construction on the site at the same time. Lead survey theory was introduced to adjust the differences of control net of super long distance, controlling the survey differences to within the allowance range of the specification for civil construction.
