A nylon net bag embedding method was carried out to study the decomposition and nutrient release of green manure Viciavillosa and ryegrass in coastal saline soil with different salinity. The results showed that the dry matter residue rate, total organic carbon content and C/N ratio of ryegrass in different salt plots were higher than those of V. villosa. The nitrogen and potassium of V. villosa were released rapidly in the first 15 days, and the residual rates in different salinity plots were 20.4%~34.0% and 13.2%~18.1% respectively. The potassium of ryegrass was released by nearly 90% in the initial 45 days, and the releasing of nitrogen and phosphorus continued in the whole decomposition process.The final residual rate of sodium in green manure in low salinity plots was 5.2%~7.6%, and in high salinity plots was 36.2%~49.2%.The residual rates of magnesium, calcium and zinc in ryegrass in different salinity plots were higher than those in V. villosa. The release of copper was mainly in the initial 45 days, and then tended to stagnate. The nutrient enrichment of magnesium, iron and manganese appeared in decomposed 45 to 60 or 45 to 75 days respectively. In general, the residue rate of dry matter and nutrient in gramineous green manure was higher than that of leguminous green manure. High salinity obviously blocked the release of nitrogen, calcium, magnesium, iron, manganese, copper, zinc and other nutrients in green manure.