A statistical analysis of external quality characters, such as ill fruit ratio, 100-grain length, 100-grain weight, and weather conditions of experimental data from 2000 to 2001 is made. Firstly relative coefficients are analyzed to find main meteorological factors affecting external quality characters, and then, the quantitative relationship between external quality character and single meteorological factor is given. Finally, the comprehensive quantitative relationship between external quality characters and meteorological factors is obtained.