Abstract: Kitchen waste or excess activated sludge could be disposed by the biotransformation technology of black soldier fly larvae (BSFL) to solve the problem of its disposal and resource utilization. The disposal and conversion of kitchen waste and excess activated sludge as culture substrate and the situations of BSFL growth and heavy metal enrichment under different feeding conditions (respectively with 0%, 25%, 50%, 75% and 100% excess activated sludge) were investigated. The results showed that after 15 d treatment process, the average reduction rate was 22.66%-56.16%, and the average biological conversion rate was 15.18%-27.84% in different groups. Furthermore, the treated food waste and excess activated sludge exhibited better characteristics and had no foul odor, indicating that preferable treatment efficiency of these solid wastes could be acquired in the synchronous disposition system by BSFL. Especially, when the mass ratio of excess activated sludge in the fodder reached less than 75%, BSFL could survive. The contents of crude protein (21.22% and 20.5%) and crude fat (18.91% and 18.5%) of BSFL in the 25% and 50% excess activated sludge groups were lower than that in the groups without excess sludge (40.75% and 37.56%), while a higher content of trace elements of the above two groups (14.24% and 14.59%) was observed in BSFL comparing to that of the groups without excess sludge (10.02%). The enrichment coefficients of heavy metals in 0% and 25% excess activated sludge groups were under the threshold value (<1). Based on these results, the BSFL fed with food waste could be served for the feed of aquatic organisms, and the BSFL fed with excess activated sludge could beserved as the feed of aquatic organisms, and the BSFL fed with excess activated sludge could be used as a feed additive for some poultry and livestock, thus enabling the resource utilization of BSFL cultivated with solid wastes.