Biochar，prepared by pyrolysis of vinegar grains and egg shells at 450 and 750℃，was composted with vinegar residue，pig manure and coal gangue to investigate how biochar affecting compost process，quality and heavy metal inactivation.The results showed that the compost arrived high temperature stage 2 and 5 days earlier than the control(T0)，and the maximum temperature was increased by 6.7 and 7.5℃，when the biochar with 450℃(T1)and 750℃(T2)were added.The seed germination index(GI)was improved and the water loss was reduced when the biochar was added into the compost.The total nitrogen concentration of 450℃ biochar and 750℃ biochar treatments were increased by 2.43% and 6.50% compared to T0，respectively.After composting，the concentration of water-soluble organic matter was decreased，while humic acid was increased significantly，especially for the 750℃ biochar addition treatment，which exhibited 50.89% increment compared with the control.After composting，the concentration of humic acid was increased while that of fulvic acid was decreased，especially in the 750℃ biochar treatment，indicating that the 750℃ biochar had a significant impact on the morphological transformation of humic acid.And the proportion of water soluble and weak acid soluble Zn and Cu were decreased，while that of oxidizable and residual states were increased after composting.The passivation rate of heavy metals was increased significantly with the biochar addition treatments than the control.The order of passivation effect of Zn and Cu under different treatments were T2>T1>T0.It showed that the addition of biochar(especially 750℃ biochar)had better promotion effects on heavy metals passivation in the compost than that of 450℃ biochar and control.The above results showed that the biochar prepared by pyrolysis of vinegar grains and egg shells at 750℃ biochar was conducive to the composting process，quality and heavy metal passivation.