Abstarct: Nowadays, the achievement of sustainable development of agricultural system, that the environment present current genereation need and the next generation provide to pay attention a lot of researchers and scientists. Life cycle assessment is a way which the most of the environmental effects of agroecosystem and evacuation the resources consider. This study to evaluate and compare the environmental impacts and depletion the resources of wheat and Sugar beet generative systems in Mayamey plain (Shahrood), using the method of life cycle assessment. According to the standard ISO 14040, life cycle assessment in four steps are defined and the objectives, life cycle of the audit, the evaluation of the impact of life cycle integration and interpretation of the results compute. Environmental index (Ecox) for produce one ton of wheat in the region include the impact of Global warming, Acidification , Terrestrial eutrification, Human toxicity and Eco-toxicity equivalent 0/43 acquired. depletion resources index (RDI) also which including evacuation lifeless resources (Fossil fuel, Phosphate rock, Potassium) reduction of Water resources and Land-use change was and equivalent 1.79 acquired. As well as for the production of one ton of Sugar beet, environmental indicators and evacuation resources index and evacuation resources indicator respectively 0.055 and 0.27 acquired. By study environmental influences can be the potential of the environmental operations of the Sugar beet and wheat agroeco-system together compare and the system that optimum condition in environment with attention to pollution reduction and optimal consumption situated have been introduced and cause improve environmental conditions.