The mixture ratio of the three strains in the decaying agent was 2∶1∶2. The experiment on the degradation of straw was carried out in the field by using the self-made straw decaying agent. The results showed that the straw decaying agent has an obvious effect of promoting the degradation. The degradation rate was 8.03% at 10 days,26.98% at 20 days, and reached to 40.2% at 30 days.