According to the experimental data of the cotton bollworm under the condition of the temperature range of 15°-35℃, the mathematical simulation models of the cumulative developmental distribution, mortality and fecundity of this pest are put forward. With these above models, a lot of the simulations are made, whether each mathematical model or the combination of these models at any constant temperature are yielded close-fitted results, compared with actual data. The sensitivity analysis is used to testing th...