Abstract: Vermireactors were set up containing pig dung and sawdust mixture inoculated with Eisenia fetida indoors to investigate factors affecting growth of and Cu or Zn accumulation in earthworms during the course of vermicomposting.Results demonstrate that earthworm growthe and substrte consumption were both boosted when the inoculation density and humidity was set at 40 mg·g^-1 and 75%,respectively;the optimal temperature for earthworm growth was 15 ℃,and for matrix consumption,20 ℃;pig dung/sawdust ratio of 6:4 was conducive to both earthworm growth and substrate consumption.Cu uptake and accumulation by earthworms were facilitated in the context of appropriate inoculation density(48 mg·g^-1),humidity (70%),temperature (15 ℃)and a higher proportion of carbon source materials in the mixture (pig dung/sawdust ratio,6:4).Lower inoculation density and a higher proportion of carbon source materials were advantageous to earthworn Zn uptake,whereas humidity and temperature exerted little effects on earthworm Zn concentration.Earthworm Zn accumulation was the highest in the treatment with 48 mg·g^-1 in inoculation density,6:4 in pig dung/sawdust ratio,70% in humidity and 15 ℃ in temperature.