Abstract: The declination of soil quality is a major concern nowadays. Due to the use of Green revolution techniques the production has increased to much extent but it has caused the detioration of the soil quality, degradation of land which ultimately affects the human health and environment. Accumulation of agrochemicals in the soil is decreasing the soil quality which also leads to less fertility of the soil. The use of green manures crops can restore the soil fertility, prevent soil erosion, improve physico-chemical properties of soil, maintain genetic balance; mainly they act as nutrient supply to the succeeding crops. They not only improve the physical, biological property of the soil but also protect the plants from diseases. Therefore, it helps in plant protection also. Various research papers, research activities of green manures are reviewed here for role of green manuring in sustainable agriculture.