Abstract: The ecological adaptability of twelve characteristics of five rice varieties of regional experiment in Jiangsu Province is evalucated by means of the relational analysis of grey system theory comprehensively. The results show that the relational analysis method of grey system theory is very effective. The results also show no difference with expression of the rice varieties. The relational grade of grey system of “9 you 138” is the most obvious,and it has good comprehensive characteristics,wide eccological adaptabitity，high and stable yield.