Disclosed herein is a method of controlling a laundry treating apparatus, if a user selects a uniform course, including performing a preheating operation of a heater (41) of a steam unit (40) to generate steam, performing a first cooling operation to operate a blower unit (30) and a moving hanger (100) after the preheating operation has been terminated, performing a steam operation to operate the blower unit (30) and the steam unit (40) and to circulate steam to a treating chamber (12) after the first cooling operation has been terminated, performing a standby operation to operate the blower unit (30) after the steam operation has been terminated, performing a second cooling operation to operate the blower unit (30) after the standby operation has been terminated, and performing a drying operation to operate the blower unit (40) and a heat pump unit (50) and to provide heat to the treating chamber (12) to dry the treating chamber (12) after the second cooling operation has been terminated.