Complex systems are every where around us. Some of them are created by nature such as ant colonies , gene networks. Other ones are created by us such as cites, financial markets. Additionally, one of them is Pedestrian Dynamics. On the other hand, the Self-organized Behavior is a crucial matter for complex systems. In other words, although pedestrians have individual preferences, aims, and destinations, the dynamics of pedestrian crowds is surprisingly predictable. Otherwise their motion is affected by repulsive interactions with other pedestrians, giving rise to self-organization phenomena. For instance, we can pointing out the crowds of people are evacuating from a room. Clogging and congested situation are made up by pedestrian in the front of the door. Obviously, in the panics it’s essential that to be solved. So here, we discussed some events by considered models in microscopic scale such as social force model. Keywords self-organization, social force model, Clogging
