During college physics teaching, viscous resistance and terminal speed are very important concepts in applying the Newton’s laws. In this paper, we compare and analyze the knowledge points of viscous resistance and terminal velocity, and simulate the motion of objects which experienced viscous resistance by VPython software, such as dandelion seeds, basketball，and the Shenzhou spaceship. Most interestingly, based on the constant mass of object, we also study and simulate the falling motion of raindrop of varying mass with the effect of viscous resistance. The results indicate that the raindrop will approach its terminal speed which is relative to the radius of raindrop. The simulation deepens the understanding of textbook knowledge.