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Changing Professional behavior of the producers to increase farm products is the prime goal of the agricultural extension projets. To approach this goal, identifying the target groups is top priority in planning these projects. In fact, combining the four major criteria including; educational needs, participating in training sessions, having utilities and applying recommendations received from the extension agent, as basis for designing social modeling of extension projects, help programmers to identify the extensions’ target groups properly. However, these criteria can mainly assist the extension agents to promote program efficiency, and at the same time, reduce the expence of the extension projects.In this research, social modeling along with the efficiency of the extension projects dealing with the biological control of Rice Stenborer were studied in Eastern part of Mazandaran province where rice is the dominant cash crop. The research method was Ex-Post Facto (correllational), since extension courses were held in before.
and 160 respondents were randomly sellected to be studied among 1215 rice growers in the area. To evaluate the social modeling of extension projects, the above four criterion were considered as the basis for judgement. Primrily, research findings showed that, 95.6 percent of the rice producers needed training in biological control. Also, it was concluded that: the less difference between the number of trained farmers and target group, the more efficient the extension projects. Moreover, there was statistically significant difference between those of target groups and none target groups in term of applying the extension biocontrol guidlines in rice production practice. The related extension projects were efficient (r= 0/73) in term of their social modelin (i,e, serving the target group more than none target group).