Free trading is considered as index of global economy and factor economic growth in many countries. In this study along with recognition of growth resources, those factors such as surplus value, Labour, capital, energy, government planning and expenditure which playing the main role in economic growth has been identified and analyzed. Also, international trade index impact along with other effective factors on surplus value are considered and estimated. The results show that Labour and energy are the most effective inputs on surplus value respectively. Then supposing that the sector experienced a productive agronomic year and supporting that Iran country was committed to a free trading framework, the relationships between various related variables were analyzed through the econometric & quantitative method to recommend an acceptable situation for joining free trade in global economy process. With respect to significant of international trade coefficient, the result indicates that in study period (1971-2000) the free trading trend had positive impact on surplus value and growth of agricultural sector and moving toward global economy will surplus its sum. But, prevailing difficulties in the agriculture sector's structure and organization may retarded the economic growth, although investment on training programs can improves the growth of agricultural sector and government investment in various part of the this section would be of huge significance. In this research related data are analyzed and after obtaining the results based on discussion some recommendations are presented.