An inkjet printing apparatus comprising: a deaeration module that is installed in a middle of an ink supply path in which ink is supplied from an ink tank to an inkjet head; a vacuum pump that is configured to expose ink to a vacuum through a gas permeable membrane of the deaeration module; an atmosphere open valve that is capable of switching a vacuum path connecting the deaeration module with the vacuum pump between an airtight state and an atmosphere open state; a control apparatus that is configured to control the vacuum pump and the atmosphere open valve, wherein the control apparatus is configured to cause the atmosphere open valve to enter the atmosphere open state, and to perform pump drying control such that the vacuum pump is operated; and a liquid feeding pump that is configured to supply the ink to the inkjet head side through the deaeration module, wherein the control apparatus is configured to perform the pump drying control in a stop state of the liquid feeding pump, wherein the control apparatus is configured to perform the pump drying control at the time of maintenance of the inkjet head or immediately after the maintenance, wherein the control apparatus is configured to perform pressure maintaining control such that driving of the vacuum pump starts at an upper limit pressure and stops at a lower limit pressure, wherein the control apparatus is configured to execute the pump drying control at a time of power off in which a main power source of the inkjet printing apparatus is turned off when a second pump continuous driving period of time necessary for reducing a suction pressure from the upper limit pressure to the lower limit pressure through the vacuum pump exceeds a predetermined determination period of time, and wherein the control apparatus is configured to perform a wiping process for the inkjet head with execution of the pump drying control at the time of power off. a deaeration module that is installed in a middle of an ink supply path in which ink is supplied from an ink tank to an inkjet head; a vacuum pump that is configured to expose ink to a vacuum through a gas permeable membrane of the deaeration module; an atmosphere open valve that is capable of switching a vacuum path connecting the deaeration module with the vacuum pump between an airtight state and an atmosphere open state; a control apparatus that is configured to control the vacuum pump and the atmosphere open valve, wherein the control apparatus is configured to cause the atmosphere open valve to enter the atmosphere open state, and to perform pump drying control such that the vacuum pump is operated; and a liquid feeding pump that is configured to supply the ink to the inkjet head side through the deaeration module, wherein the control apparatus is configured to perform the pump drying control in a stop state of the liquid feeding pump, wherein the control apparatus is configured to perform the pump drying control at the time of maintenance of the inkjet head or immediately after the maintenance, wherein the control apparatus is configured to perform pressure maintaining control such that driving of the vacuum pump starts at an upper limit pressure and stops at a lower limit pressure, wherein the control apparatus is configured to execute the pump drying control at a time of power off in which a main power source of the inkjet printing apparatus is turned off when a second pump continuous driving period of time necessary for reducing a suction pressure from the upper limit pressure to the lower limit pressure through the vacuum pump exceeds a predetermined determination period of time, and wherein the control apparatus is configured to perform a wiping process for the inkjet head with execution of the pump drying control at the time of power off.