the first air inlet 112 is connected to the inflatable product 50 and the pressing member 42 of the air valve 40 beside the first air inlet 112 is pressed down by the connected inflatable product 50 with further reference to fig7 the sliding board 41 of the air valve 40 is moved down when the pressing member 42 is pressed down and the air vents 41 on the sliding board 41 misalign with the first supplement air inlets 122 so that the first supplement air inlets 122 are blocked and the second air chamber 121 is sealed from the surrounding environment the power switch 30 is switched on to start the motor 21 the motor 21 drives the impeller 22 to rotate and rapidly discharge air in the inflatable product 50 through the first air inlet 112 to the second air inlet 113 meanwhile air in the inflatable product 50 can also pass through the deflation passage 115 to enter the axial open sides 224 of the impeller 22 opposite to the first air inlet 112 with the double sided axial open sides 224 on the impeller 22 the deflation efficiency of the air pump is enhanced when air of the inflatable product 50 is fully discharged the power switch 30 is switched off the features and advantages of the air pump in accordance with the present invention are as follows 1 with the design of the double sided blades 222 of the impeller 22 and the air inlets 112 113 114 115 and air chambers 111 121.