Pig manure was mixed with wheat straw as bulking agent, the mixtures were amended with 0 or 10% additives including apple pomace, calcium superphosphate and biochar of total dry weight and composted for 46 d. Effect of three additives on composting process were studied. Additives of apple pomace and biochar could shorter the time to reach the high temperature period, electricity conductivity were 4.2, 5.4 and 2.8 mS/cm with three additives in the end, respectively. Three additives showed the abbility of nitrogen conservation. The decrease rate of N loss compared with control were 55.3%, 54.4% and 58.6%, respectively. Rate of DTPA form in total amount decreased with 3.9%, 5.8% and 5.7% for Zn, 11.0%, 12.0% and 12.3% for Cu in three additives, respectively. The differences were not significant. Analysis of Sposito forms showed that Zn was mainly in the forms of SP3 and SP4, reached to 74.5%～87.4%, while Cu in the forms of SP2 and SP4, reached to 69.0%～80.9% of the total amount. SP1 form of Zn with treatments of calcium superphosphate and biochar decreased more than apple pomace, while SP1 form of Cu with treatment of calcium superphosphate decreased the most.