Abstract　 　　
　 This presentation will introduce some of our new results on the global simulation of the solar wind-magnetosphere interfaces (the magnetopause and open-closed boundary). Using the numerical data from a physics-based global MHD model, we first construct a new function which is applicable for approximating global magnetopause locations at both low and high magnetospheric latitudes. This new model allows description of the cusp geometry as well as the azimuthal asymmetry, and is a function of interplanetary magnetic fields (BY and BZ), solar wind dynamic pressure (Pd), and dipole tilt. Model results agree well with empirical models from observation data, and effects of IMF BY, BZ, Pd, and dipole tilt on the magnetopause configuration parameters are analyzed. Then we look at a relatively unusual interval on 5th June 1998, where open/closed field line boundary can be determined in the ionosphere using a combination of instruments during a period encompassing northward to southward interplanetary field turning. It is shown that when the inner magnetospheric module (Rice Convection model) is incorporated, the modelling both qualitatively and quantitatively reproduces many elements of the studied interval prior to an observed substorm onset. These studies show the global modeling is able to provide a valuable and reliable tool for global magnetospheric topology, and suitable for the purpose of space weather.