<p>The Atlantic Meridional Overturning Circulation (AMOC) serves as an important conduit for poleward heat transport in the global ocean, playing a crucial role in regulating global climate. However, biases have been found in multi-model simulations of AMOC, particularly due to inaccuracies in convective mixing parameterization, which leads to an overestimation of convective mixing depth in the Labrador Sea and Nordic Seas. This excessive deep convection results in stronger simulated AMOC transport compared to observations. Therefore, this study employs the Large Eddy Simulation (LES) method to simulate the sinking process of dense water using a series of idealized experiments with various sea surface salt flux, latitude, and ocean stratification. The results show that increased salt flux forcing and weakened background stratification both enhance the sinking of dense water, with geographical location (latitude) exerting a discernable impact. Based on these insights, the eddy viscosity coefficient, which characterizes vertical convective mixing in the parameterization scheme, is refined, with adjustments to its vertical structure and the incorporation of latitude dependence. It is preliminarily applied to simulate AMOC using the Community Earth System Model (CESM). The results demonstrate improvements in the simulation accuracy of seawater temperature at the near-surface and deep layers. Including the parameterization scheme of dense water sinking in the model leads to a reduction in the simulated intensity of AMOC at 26.5°N. In the high-latitude North Atlantic, the modification implemented in parameterization results in notable improvements in the simulation of seawater temperature, salinity, and density, with respective reductions in their root mean square errors of 4.36%, 19.77%, and 1.84%.</p>