Simulating deformable objects has been a topic of interest for more than a decade.  Classical methods of animation such as key framing require a tiresome and rigorous process to simulate scenes containing deformable models.  Dynamic simulation techniques offer a solution to this problem.  Often, dynamic simulation methods use physically based animation methods where models have physical properties which are simulated through time by using Newtonian laws. One of the ways to model and simulate models physically is to discretise models in some points and connect these points by some forces such as damped spring forces or forces governed by particle dynamics.  Using mass-springs networks has been very popular in modeling deformable objects, because of the ease of modeling, satisfactory speed and reality they offer.  This work reviews several methods employed to simulate deformable objects, and emphasizes mass-spring network based methods.