Sensitivity analysis has been applied to both of density dependant and density independant population system. Input disturbance has been done by increasing and decreasing 20 percent of spring emerging adults in the computer program. Parameters disturbances by increasing and decreasing 20 percent of temperature in the early days, in the middle days, or in the late days of a hundred simulation days. The results are listed in Table 1. The results show that the system which only has density dependant survival r...