This invention relates to a leakage detection method for closed container, wherein, arranging sensors for temperature and moisture, filling gas or vacuumizing to seal and collect the container temperature value t within -25Deg~80Deg and corresponding moisture value h(t) for the creation of fitting curve equation h(t)= nsigmat=0 ait'; by the temperature value t and moisture value h(t) calculating the ai as fitting curve parameter value; writing the curve equation into the memory; using sensors to gather real values and fitting equation to calculate the theoretic values; when the relative humidity error more than 10%, alarming. This invention can foresee sensor variation accurately to ensure the device reliability and application in different fields. |