Abstract: Protoplanetary disks form as a result of angular momentum conservation during the protostellar core collapse and play an important role in planet formation. A study of protoplanetary disks evolution is important for us to understand the formation of our solar system. In this talk, I will talk about internal and environmental effects on evolution of protoplanetary disks. For internal effects, I will talk about the accretion and disk wind. For the environmental effects, I will show that the photoevaporation driven by the UV photons from massive stars dominates the protoplanetary disk evolution in massive clusters.