Food waste which had been mixed with night soil sludge and composted for 21 days (mixing ratio = food waste/paper mill sludge : 1, w/w) was supplied to the 5 g of Eisenia fetida popualtion at various temperatures (5, 6, 7, 8, 9, 10, 15, 20, 25, 30, 31, 32, 33, 34, 35$^{circ}C$). The biomass of earthworms one month after feeding at 20-32$^{circ}C$ was about two times more than that of the introduced earthworms, increasing rate of which was much higher than them at the other tested temperatures . There were decreases at temperatures below 7$^{circ}C$, and less increases at temperatures of 8-10$^{circ}C$ in biomass. Earthworms could not survive at temperatures at 34$^{circ}C$ and 35$^{circ}C$. Feeding rates of earthworms were much higher at 20-32$^{circ}C$ than them at the other tested temperatures, and there were no differences among them at temperatures of 20-32$^{circ}C$. But at 3 months after feeding, the biomass and feeding rate of earthworms decreased severely even at 20$^{circ}C$ and 30$^{circ}C$, which was supposed to be due to the long term effect of salts, especially sodium chloride (NaCl) in the food wastes.