Method of repairing wind turbine blade

A method of repairing a wind turbine blade for a damage portion caused by a lightning strike, the method comprising the steps of:

• based on inspection results of the wind turbine blade, determining whether or not the damage portion has a size less than a criterion;
• when the size is less than the criterion, sanding and removing a circular region of a coating layer of the wind turbine blade to expose a glass fiber reinforced plastics (GFRP) layer of the wind turbine blade under the circular region of the coating layer of the wind turbine blade, the exposed glass fiber reinforced plastics layer encompassing the damage portion;
• and
• bonding onto the exposed glass fiber reinforced plastics layer a repairing member prefabricated and procured such that stacked glass fiber materials embedded in the repairing member is arranged outside an outer skin of the wind turbine blade, the repairing member having a circular shape corresponding to the circular region,
• wherein the exposed glass fiber reinforced plastics layer encompassing the damage portion is covered by the stacked glass fiber materials of the repairing member.