[Objective] To explore the effects of synergy between earthworms(Eisenia foetida) and effective microorganisms(EM) on vermicomposting of pig manure and to provide a new idea for rational and effective utilization and treatment of animal manure.[Method] Four treatments were used to compost pig manure,namely,EM-inoculated manure,earthworms-inoculated manure,EM and earthworms-inoculated manure and control(CK) manure.The experiment lasted for 60 d.On Day 0,15,30,45 and 60,the pig manure was collected,and the content of total organic carbon(TOC) ,total Kjeldahl nitrogen(TKN) ,ammonium nitrogen,nitrate nitrogen and water soluble carbon(WSC) was determined,respectively.[Result] Compared with the control,the EM and earthworms-inoculated manure had a decrease of 42.8% in the TOC content,an increase of 13.6% in the TKN content,a decrease of 49.5% in the carbon nitrogen ratio,the conversion rate of ammonium nitrogen of 98.1%,a 96 times increase in nitrate nitrogen,the ratio of nitrate nitrogen to ammonium nitrogen of 61,and a decrease of 58.9% in the WSC content.[Conclusion] The synergy between earthworms and EM can accelerate maturation of pig manure and improve mineralization and stability of products. [Objective] To explore the effects of synergy between earthworms (Eisenia foetida) and effective microorganisms (EM) on vermicomposting of pig manure and to provide a new idea for rational and effective utilization and treatment of animal manure. [Method] Four treatments were used to compost pig manure, namely, EM-inoculated manure, earthworms-inoculated manure, EM and earthworms-in manure and control (CK) manure. The experiment lasted for 60 d. On Day 0, 15, 30, 45 and 60, the Pig manure was collected, and the content of total organic carbon (TOC), total Kjeldahl nitrogen (TKN), ammonium nitrogen, nitrate nitrogen and water soluble carbon (WSC) was determined, respectively. [Result] Compared with the control, the EM and earthworms-inoculated manure had a decrease of 42.8% in the TOC content, an increase of 13.6% in the TKN content, a decrease of 49.5% in the carbon nitrogen ratio, the conversion rate of ammonium nitrogen of 98.1%, a 96 times increase in nitrate nitrogen, the ratio of nitrate nitrogen to ammonium nitrogen of 61, and a decrease of 58.9% in the WSC content. [Conclusion] The synergy between earthworms and EM can accelerate maturation of pig manure and improve mineralization and stability of products.