The tolerances of rice brown planthopper (BPH) biotypeⅡ and biotype ‘Bangladesh’to high temperature, starvation, immersion, and insecticides were studied. There were no significant difference in survival times of the two biotypes at 26.0 ℃or 37.5 ℃.However, biotype ‘Bangladesh’ survived longer at 35.0 ℃ than did biotypeⅡ, and biotypeⅡ’survived significantly longer at 40.0 ℃ than did biotype ‘Bangladesh’. There were no significant difference between the two biotypes in their tolerances to starvation at any temperature. There were no significant differences in the hatching rate of eggs of the two BPH biotypes after being immersed in water for 1 day、3 days or 5 days, but the hatching rate of biotypeⅡafter immersion for 5 days was greater than that of the control,it show that the hatching rate of biotypeⅡcan be influenced when being kept soaking in water for 5 days.When feeding on the rice which had been kept soaking in water for 5day, the death rate of nymphs of biotypeⅡwas significantly different than that of the control after 168 hours, but the death rate of biotype‘Bangladesh’ was not significantly different from that of the control. Second or third mature BPH of both biotypes grew into adult form after 168 hours, but those in the treatment grew into adult form after 216 hours. This shows that feeding on rice that had been kept soaking can delay the process of development of nymphs. The LC50 of Methamidophos significantly lower for biotype‘Bangladesh’than or biotypeⅡafter spraying it 1day or 2days, Similarly, the LC50 of Buprofezin was significantly lower for biotype ‘Bangladesh’ than or biotypeⅡafter spraying it 5days.Thus, BPH biotype Bangladesh was more susceptible to two insecticides than BPH biotypeⅡ.