The combustion of fuel is an exothermic reaction and the amount of exhausted energy could be measured in term of temperature using thermocouple. The signal from the temperature measurement was amplified and converted to control the speed of feeding motor and the inlet air. This research work dealed with a feedback control system : a computer was linked with the converter and temperature controller. Softwares were developed by setting correlations for proportional and proportional integral control. The experimental results that all two types of software contribute to a steady and continuous control of combustion system at the same Kc (proportional gain) value. The errors of temperature and standard deviation in each type were as following : (1) The proportional : error of temperature <8 ํC, Standard deviation = 5.10 ํC (2) The proportional integral error of temperature < 18 ํC, Standard deviation = 3.67 ํC.