Abstract: Author measured the flesh firmness and primary chemical qualities along with kiwifruit’s cold-storage. Prime component analysis was made on chemical indexes of kiwifruit, the first prime component was derived and called as quality factor which synthesized seven chemical indexes. And the quality factor and flesh firmness had high correlation, which can be fitted by cubic polynomial equation with the R 2 more than 0.988. The flesh firmness can be applied to evaluate storage quality ofk iwifruit.

Key words: kiwifruit, firmness, quality, correlation