Vietnam’s Sea resides in a highly intricate tidal region marked by diverse surface waves, internal waves, and currents. Hence, using a local topography model as the foundation for the reference of depth observations is required. For this reason, we build the Mean Dynamic Topography Model (MDTVN22) as a national reference system for transferring topographic measurements, effective management of national marine resources, and seamless integration with global topographic models. Through rigorous statistical tests, we determine and correct systematic errors from converting models DTU15MDT into MDTVN22. Employing the spline algorithm with barriers, we plot the seabed topographic map based on the MDTVN22 model with an accuracy of ~7.5 cm. This map is visualized on a scale of 1:2000000 with grids measuring 1′ ×1′. These findings significantly contribute to the national database for managing marine resources and monitoring the Vietnamese continental shelf in the future.