Earthquake is one of the factors that considered less than other disasters. However, according to critical conditions of our country and Potential vulnerability to earthquake, it must be taken into account as one of the most basic natural destructive elements. Most of the researches on earthquake deal with issues, such as the increased resistance of the instruction by using durable and high quality of materials. Of course while confirming this principle it is important to note that what areas are most and least vulnerable in the present situation? Indeed, earthquake as a natural phenomenon does not cause undesirable results itself. What makes this phenomenon a disaster is the lack of prevention and readiness to deal with its consequences? The aim of present investigation is to evaluate the vulnerability, its rate and also ways of reducing vulnerability in Chalous city. To commence study and Identification of restricted vulnerable areas, real data from Property audits plan was used. And also the data base was made for recognizing how much of buildings are Vulnerable against earthquake and also we investigate the vulnerability. The current study seeks to show a relationship between factors such as Area Components, Building lifetime, kinds of materials, the quality of instructions, number of floors, Proximity the fault and vulnerability in development area.