Abstract: The stable,reliable and special measurement and control network can provide the guarantee for the construction of steel box beam.It analyzes the characteristics of steel box beam construction and the difficulty of control network layout of the south sub bridge of Yellow River Bridge from Yuanyang to Zhengzhou section of Anyang-Luoshan expressway.It studies the location selection of control points,construction of observation platform and measurement methods of control network,and puts forward some schemes such as the survey and control network layout of steel box beam,construction of top beam pier and elevation measurement of opposite triangle.