with a treatment gas containing oxygen wherein a deactivation step for deactivating the coal in a temperature range 45 70 u00b0 c is carried out application_number US 201214367805 A description embodiments of a coal deactivation processing method of the present invention are described based on the drawings however the present invention is not limited to the embodiments described below based on the drawings a first embodiment of a coal upgrading method using a coal deactivation processing method of the present invention is described based on fig1 and 2 as shown in fig1 first low grade coal 10 with high water content such as brown coal and sub bituminous coal is heated about 150 u00b0 c to about 300 u00b0 c in an atmosphere of inert gas 1 such as nitrogen gas to cause moisture 3 to evaporate from the coal 10 and is thereby dried drying step s 11 then the coal 10 is further heated about 300 u00b0 c to about 500 u00b0 c in the atmosphere of the inert gas 1 to remove pyrolysis gas 4 of a low boiling point component and pyrolysis oil 5 of a high boiling point component from the coal 10 through distillation pyrolysis step s 12 after being cooled about 40 u00b0 c to about 60 u00b0 c cooling step s 13 the pyrolized coal 10 is subjected to heat treatment 40 u00b0 c to 95 u00b0 c preferably 45 u00b0 c to 70 u00b0.