For the difficulties encountered in the quality control of multi-beam bathymetry data,research and technical analysis are conducted on the control methods and main influencing factors of data quality.By adopting methods such as repeated measurements and verification measurements,this article proposes solution measures to significantly reduce the error of the beam edge.Taking the first phase project in the east area of Yantian Port,Shenzhen Port as an example,the results of secondary retest are compared and analyzed with the results of the single beam verification measurement.The results show that selecting better sea conditions,replacing ship types,strengthening sensor installation modes,optimizing data acquisition parameters and other methods,not only ensure that the data is accurate and reliable,but also achieve high quality results.It is mainly applicable to the high-precision measurement requirements such as engineering quantity accounting,and provide important reference value for similar projects.