This study evaluated the relationships between some environmental factors and race performance of purebred Arabian racehorses in the Turkish Jockey Club. For this purpose, the belonging 60 purebred Arabian horses (45 males and 15 females) which registered to Turkish Jockey Club was benefited from 3087 races records. In the research, the effect of gender, age, race distance, dam age, and the city in which the race took place to race performance on the turf and dirt track was investigated. In the environmental factors affecting race speeds of horses were found statistically different. The turf track, dirt track and general average of the race speed were calculated as 14.45±0.02 m/sec, 13.52±0.01m/sec and 13.77±0.01 m/sec, respectively. The horses's race performance results; it was better than others the turf track, male, short distance, 9-12 dam age, 3 age, and Istanbul, for the race track, gender, race distances, dam age, race age, and race city, respectively. In conclusion, it is thought that performing of similar studies with more horses and more comprehensive studies may be more useful in examining the race performance of horses.