A method for controlling a laundry treatment apparatus, the laundry treatment apparatus comprises: a drum for accommodating laundry, an air channel configured to cause air to flow into the drum and flow out from the drum, a fan disposed on the air channel, and a fan motor configured to rotate the fan, wherein the method comprises the steps of: - starting a drying operation by rotating the fan motor at a base RPM; - controlling a RPM of the fan motor which is increased if it is determined that airflow is in an abnormal state while the fan motor is rotating after the drying operation start step is started; and - determining (S311, 312) whether a condition considered as the abnormal state of airflow is satisfied, wherein the condition is satisfied if the airflow in the air channel is less than or equal to a predetermined value characterized in that the method further comprises the steps of, if it is determined that the airflow is in the abnormal state, increasing the RPM of the fan motor to a predetermined first increased RPM, and if it is determined that the airflow is in the abnormal state in a state where the RPM of the fan motor is the first increased RPM, increasing the RPM of the fan motor to a predetermined second increased RPM higher than the first increased RPM. a drum for accommodating laundry, an air channel configured to cause air to flow into the drum and flow out from the drum, a fan disposed on the air channel, and a fan motor configured to rotate the fan, wherein the method comprises the steps of: - starting a drying operation by rotating the fan motor at a base RPM; - controlling a RPM of the fan motor which is increased if it is determined that airflow is in an abnormal state while the fan motor is rotating after the drying operation start step is started; and - determining (S311, 312) whether a condition considered as the abnormal state of airflow is satisfied, wherein the condition is satisfied if the airflow in the air channel is less than or equal to a predetermined value characterized in that the method further comprises the steps of, if it is determined that the airflow is in the abnormal state, increasing the RPM of the fan motor to a predetermined first increased RPM, and if it is determined that the airflow is in the abnormal state in a state where the RPM of the fan motor is the first increased RPM, increasing the RPM of the fan motor to a predetermined second increased RPM higher than the first increased RPM. - starting a drying operation by rotating the fan motor at a base RPM; - controlling a RPM of the fan motor which is increased if it is determined that airflow is in an abnormal state while the fan motor is rotating after the drying operation start step is started; and - determining (S311, 312) whether a condition considered as the abnormal state of airflow is satisfied, wherein the condition is satisfied if the airflow in the air channel is less than or equal to a predetermined value characterized in that the method further comprises the steps of, if it is determined that the airflow is in the abnormal state, increasing the RPM of the fan motor to a predetermined first increased RPM, and if it is determined that the airflow is in the abnormal state in a state where the RPM of the fan motor is the first increased RPM, increasing the RPM of the fan motor to a predetermined second increased RPM higher than the first increased RPM.