A method of manufacturing a radiation intensity bolus, and evaluating the manufacturing accuracy, comprising steps of: (a) calculating, by a radiotherapy treatment planning unit, a received 3D radiation dose distribution, obtaining radiation intensity modulation information, and planning a bolus to be manufactured; (b) reading, by a bolus design unit, the radiation intensity modulation information from the radiotherapy treatment planning unit, and generating a conversion file for manufacturing the planned bolus in a 3D printer; (c) receiving, by a bolus manufacturing unit, the conversion file for manufacturing bolus, verifying a type, location, and size of the bolus to be manufactured, sending the verified data to the 3D printer, and manufacturing the bolus; and (d) obtaining, by an accuracy verification unit, information about a 3D structure of the manufactured bolus and evaluating manufacturing accuracy by comparing the information about the 3D structure of the manufactured bolus with the information about the planned bolus, wherein the step (b) comprises steps of: calculating, by the bolus design unit, information about a thickness of each pixel of the bolus to be manufactured that is proportional to an amount of radiation intensity modulation; generating, by the bolus design unit, initial data by which the size of the bolus to be manufactured is calculated; generating, by the bolus design unit, an initial bolus of the bolus to be manufactured based on the initial data; and calculating, by the bolus design unit, information about 3D structure and information about 3D coordinates of the bolus to be manufactured based on the initial bolus; and determining, by the bolus design unit, the size of the bolus to be manufactured, (i) by calculating the 3D structure of the bolus to be manufactured in accordance with a distance inverse square law based on a location where the bolus to be manufactured is attached to a treatment unit, an radiation source, and a distance from a patient, and (ii) by calculating an attenuation of radiation according to material of the bolus to be manufactured using an attenuation coefficient or a stopping power ratio depending on the type of radiation, wherein the conversion file for manufacturing bolus includes information about the type of the material of the bolus, information about the calculated 3D structure of the bolus, information about the calculated 3D coordinates of the bolus, information for identifying the patient, information about the treatment unit to be used, and information about a radiation port of the treatment unit. (a) calculating, by a radiotherapy treatment planning unit, a received 3D radiation dose distribution, obtaining radiation intensity modulation information, and planning a bolus to be manufactured; (b) reading, by a bolus design unit, the radiation intensity modulation information from the radiotherapy treatment planning unit, and generating a conversion file for manufacturing the planned bolus in a 3D printer; (c) receiving, by a bolus manufacturing unit, the conversion file for manufacturing bolus, verifying a type, location, and size of the bolus to be manufactured, sending the verified data to the 3D printer, and manufacturing the bolus; and (d) obtaining, by an accuracy verification unit, information about a 3D structure of the manufactured bolus and evaluating manufacturing accuracy by comparing the information about the 3D structure of the manufactured bolus with the information about the planned bolus, calculating, by the bolus design unit, information about a thickness of each pixel of the bolus to be manufactured that is proportional to an amount of radiation intensity modulation; generating, by the bolus design unit, initial data by which the size of the bolus to be manufactured is calculated; generating, by the bolus design unit, an initial bolus of the bolus to be manufactured based on the initial data; and calculating, by the bolus design unit, information about 3D structure and information about 3D coordinates of the bolus to be manufactured based on the initial bolus; and determining, by the bolus design unit, the size of the bolus to be manufactured, (i) by calculating the 3D structure of the bolus to be manufactured in accordance with a distance inverse square law based on a location where the bolus to be manufactured is attached to a treatment unit, an radiation source, and a distance from a patient, and (ii) by calculating an attenuation of radiation according to material of the bolus to be manufactured using an attenuation coefficient or a stopping power ratio depending on the type of radiation, wherein the conversion file for manufacturing bolus includes information about the type of the material of the bolus, information about the calculated 3D structure of the bolus, information about the calculated 3D coordinates of the bolus, information for identifying the patient, information about the treatment unit to be used, and information about a radiation port of the treatment unit.