4. The maximum number of days that data on the chart to comparison the different types of slow down maturation and the level of satisfaction when we are using different types of slow down maturation. 5. Design modeling to slow down the ripening of bananas by automatic system. The members are designed construction model. Using the principles of automatic control by apply the sensor for check ethylene gas. When the ethylene gas is exceeded. The program system will operated to vacuum the air. Then it is ventilated ethylene gas out. So when the ethylene gas are decreased, the system are closed program.