The sludge reduction and harmless treatment is realized by automatically controlled system.Using sludge andmushroomslag，two tests are designed in the fermenter with the automatic control unit based on SIEMENS -PLC.The impactof changing aeration rate at different time and the aeration frequency per hour on the composting process isanalyzed.Fromthe perspective of oxygenconsumption，watercontent，electrical conductivity，seed germinationindex，total nitrogenloss，and cumulative ammonia emissions，the results indicate that the first test has a better result in term of when the material watercontent is60%±2%，aeration rates are0.1，0.4，0.6，0.3，0.6 m 3/h，and aeration is once per hour for 15 min；Afteranalysis and comparison，the first level indicators(temperature，watercontent，conductivity，pH)are adopted as the criterion of industrialized maturity in a simple and fast manner.