Abstract: It is proposed that the relationship between the fiber quality of raw ramie and the quality of its yarn may be expressed by the grey system.And the grey system analysis method was described and used to determine the effect of ramie fiber quality on the quality of its yarn and found that its influence on the yarn quality was in the order: the strength of the fiber > the diameter of the fiber> the length of the fiber.This finding is consistent with practical observations and shows that the grey system analysis provides a better method for parametrical analysis of ramie yarn quality.