This study aims to provide the basic data for the improvement of swimming performance of swimmers with intellectual and developmental disabilities, analyzing technical factors and race strategies in the race, which are important in swimming through an approach from sports science to the race management of excellent swimmer In-guk Lee in the swimming event of swimmers with intellectual and developmental disabilities. For this purpose, the whole sections were filmed by installing two video cameras were at an interval of 25m to analyze the videos of freestyle 200m swimming race in the National Sports Games for the Disabled for the last three years in which the excellent swimmer with intellectual and developmental disabilities participated. For the analysis of data, based on the final record in freestyle 200m swimming, the mean speed, and record and speed in each section were examined by dividing them by the start section, the swimming section, and the turn section. As a result of the study, first, in his record and speed in each section of freestyle 200m swimming, he started fast to the first 50m section and showed a good record, maintaining a constant speed in the section from 50m to 200m in 2017 and 2018 as compared to 2015. It is judged that this results from the improvement of his physical ability of swimming while maintaining a certain speed in the section from 50m to 200m, and his record will further improve if physical training for swimming faster in the section from 150m to 200m is added. Second, of the technical factors in the starting section, underwater swimming distance was the longest in 2017 (16.10m) when he showed the best record and judging from this, it is desirable that he will maintain an underwater swimming distance of at least about 15m. Third, as for the number of strokes in each section, since he showed a faster record with smaller strokes while swimming 200m freestyle in 2017 and 2018 as compared to 2015, it is judged that he made use of more efficient strokes, and it is judged that the upper body muscular strength and muscular endurance in the motion of pushing in the water improved. It is judged that examining the physical factors, including muscular strength in the analysis of performance in the future will help analyze the relationship between physical strength and performance. Lastly, it is noted that his consistency improved while swimming 200m since of the technical factors of the turn section, the turn section was maintained constant at 5-6m in 2017 and 2018. It is judged that the application of these findings to the composition of the actual training will be utilized as the basic data for the improvement of the performance of freestyle swimmers with intellectual and developmental disabilities in the field as well as the improvement of the excellent swimmer’s performance.