In order to improve the effects of garden wastes compost,four treatments included CK（garden wastes +sheep manure）,T₁（garden wastes + sheep manure + starter）,T₂（garden wastes + sheep manure + compound microbial agent） and T₃（garden wastes + sheep manure + starter + compound microbial agent） were set up in this research.The effects of adding starter and compound microbial agent on the garden wastes compost were studied by testing the temperature,pH value,EC value,C/N and microbial characteristics of compost.The results showed that the addition of starter and compound microbial agent to garden wastes compost had obvious advantages in heating rate,maximum temperature,high temperature days,C/N,microbial diversity,seed germination and plant growth of lettuce.Among them,the best effect was T₃ treatment which the highest compost temperature reached 64.5 ℃,the heating time was only 6 days and the days of high temperature was 15 days（T ＞ 55 ℃）.The pH and EC values of T₃ were 8.37 and 3.33mS/cm,respectively,and the C/N reached the maturity standard（＜ 20） on the 20th day.Compared with CK,the number of fungi in T₃ compost products decreased by 44.72% and the number of bacteria,actinomycetes,total microorganisms,’bacteria/fungi’’actinomycetes/fungi’,AWCD and Shannon index were increased by 36.35%,25.48%,146.64%,126.11%,31.03% and 16.29%,respectively.The lettuce seed germination rate,germination potential and germination index of T₃ product increased by 14.81%,34.4% and 29.91% respectively compared with CK,and the plant height,stem diameter and dry weight increased by 18.98%,26.47% and 26.54%,respectively.