Membrane proteins (e.g., ion channels and transporters) perform a variety of functions vital to the survival of organisms and they are the target of over 50 % of all modern medicinal drugs. Molecular dynamics (MD) simulations of membrane proteins have provided deeper insights into their functions and interactions with surrounding environments at the atomic level, and thus MD simulations have become a popular and powerful technique to study membrane proteins. We present basic ideas of MD simulations and review recent MD simulations studies of membrane proteins. Then, we introduce you our recent work on one of sugar transporters, vSGLT, and its importance.