For producing single cell protein from the agricultural waste, heat treatment and antibiotics on the growth of Cellulomonas sp. KL-6, isolated in rotting leaf and the adjacent soil mixture, were examined. The organism was able to grow until 5 min. at $65^{circ}C$, 1 min. at $75^{circ}C$ and 1/4 min. at $85^{circ}C$ in gradually rising temperatures. It can be Seen that preheating the suspension at $48^{circ}C$ results in a marked decrease in heat resistance. On heating at temperature of $55^{circ}C$ for 30 min., strain KL-6 was more resisted in the 0.1 M phosphate buffer when such substrates as casamino acid (1%), yeast extract (1%) or xylose (5%) were added to it whereas this organism was appeared weaker resistances in 0.1 M phosphate buffer when cysteine (0.03 M), sodium citrate (1%) or casein (1%) were in fused into it. Test strain was susceptible to penicillin-G $(1.563;{mu}g/ml)$ and ampicillin $(3.125;{mu}g/ml)$, but the organism was resisted to kanamycin $(>200;{mu}g/ml)$. The treatment of strain KL-6 with sodium dodecyl sulfate (SDS) resulted in the elimination of R-plasmid from the host strain and the elimination rate with SDS $(10{sim}30;{mu}g/ml)$ was about $9.2{sim}31.2%$, respectively.