the entire gas balance training bomb has been assembled the gas can be filled into the training bomb through the nozzle 31 that is exposed enabling the gas to pass through the gas guiding assembly 30 to be stored between the active gas chamber 70 and the passive gas chamber 80 with a flow route of the gas shown as arrows in the drawings therefore the gas pressure between the active gas chamber 70 and the passive gas chamber 80 will be balanced allowing the piston 50 to keep at a balance position in the present invention the filling gas is the natural gas referring to fig4 it shows a local exploded view of the present invention when assembling the guide tube 32 and the gas choking tube 33 of the gas guiding assembly 30 a proper gap is provided between the guide tube 32 and the gas choking tube 33 therefore when the gas is filled into the active gas chamber 70 and the passive gas chamber 80 through the nozzle 31 the gas can be guided into the passive gas chamber 80 by the gap between the guide tube 32 and the gas choking tube 33 in a mean time a part of the gas will be guided into the active gas chamber 70 through the gas choking tube 33 further achieving the gas pressure balance between the active gas chamber 70 and the passive gas chamber 80 such that the piston 50 is abutted at an exterior of the gas storage cylinder 60 enabling the active gas chamber 70 to form a sealed condition thereby being able to store the gas referring to fig5 it shows a cutaway view of a first.