With the development of market economy and people’s increased demand for green food(i.e., safe, nutritious and non-polluting), a higher quality of agricultural products is also needed. Therefore,green manure planting had again received widespread interest. Since 2006, the planting area of green manure in China has increased to 2.7 million ha. In 2008, the seeded area utilizing green manure was 437 million ha. The total weight of green manure produced was 9 339 million t and the amount incorporated into soil was 4 558 million t. The green manure in the southern region of Yangtze River is mainly used to improve soil fertility by being returned to the field. Green manure is one of the cleanest organic manure resources, with no heavy metals, antibiotics, hormones and other residual hazards. The large amount organic matter in green manure helps improve soil microbial properties and quality of arable land. Additionally, the nutrients contained can substitute for artificial fertilizers to some extent. Green manure not only improves crop yields and soil fertility but can also improves the quality of agricultural products (Yang et al. 2010; Xu 2011).