Abstract:The toxicity analysis of tebufenozide against Dendrolimus punctatus was studied·The rlesuhtS showedthat in laboratory tebufenozide(24％)could kill the 3rd instar pine caterpillar with the average mortality of 100．00％，94．20％，99．20％，78．30％，85．50％and 79·10％ respectivelv when it WaS diluted with water to 120，70，35，14，7 and 3．5 Ml／Kl．In the forest of Pingle County，Guangxi Zhuang Autonomous Region，the average mortality were 93．47％，91．55％，85．52％and 70．32％respectively when tebufenozide was diluted with 啪ter t0 120，80，60 and 40 Ml／Kl．In Pingle County，Guava Zhuang Autonomous Re— gion，at the Same concentration of tebufenozide as mentioned above，the average mortality were95．79％，92．91％，76．93％and 74．94％respectively．Data analysis checked by LSR test showed that the differences were quite significant between treatment and control