This paper aims to explore the correlation among several swimming ability, including endurance, speed and skills. Thirty-four swimmers were examined and their skills were critically assessed. After analyzing the data by applying the statistics of Pearson's Product-moment Correlation, we reached the following conclusion: A. Endurance is surely correlated to speed in butterfly, back storke and crawl. B. Endurance and skills 1. Male swimmers' endurance is positively related to skills in all the four styles. 2. Female swimmers' endurance is positively related to skills in crawl. C. Speed and skills 1. Male swimmers' speed in butterfly, back stroke and crawl is positively related to their skills. 2. Female swimmers' speed in crawl is positively related to their skills in butterfly, back stroke and crawl.