Despite the absence of research - based information, it seems that the incidence trend of running away in Iranian girls has increased in last years. Although the running away is not equivalent the occurrence of survival sex, it should be considered as a serious impact of tuning away in girls. So, the researchers and decision - makers in the field of prostitution should pay a special attention to this sub group of population. This paper as a part of "A survey on runaway girls project", presents some related aspects of survival sex Such as the pattern of sexual contacts, simultaneous behavioral problems, utilization pattern of health services, psychological problems and knowledge, attitude and practice about prevention of AIDS. The methods consists of a survey on 110 subjects anti FGD technique in 4 groups. About half of the subjects had been experienced the. survival sex after running away from home. 60 percent of this cases had been experienced it during first week after running away. The accessibility of subjects to health services was insufficient. They had low level of knowledge, inappropriate attitude and unacceptable practice about prevention of AIDS. Finally, in this paper the principle of preventive strategies are discussed and some research subjects in the field of survival sex in runaway girls are suggested.