This research attempted to establish standard weight (Ws) equations of the swordtip squid, Uroteuthis edulis, and used to calculate and analyze the changes of individual Wr. The results showed that there have significant differences between the weight - length relationship in both sex. The standard weight equation: the male log10Ws = -2.7641 + 2.2056 (log10ML); the female log10Ws = -2.9959 + 2.3309 (log10ML), where Ws was the standard weight (in grams units), ML was mantle length (in millimeters). This study showed that the swordtip squid's Wr fluctuate with year and season. Wr would be used as an indicator of the state of individuals and reflected the changes in the environment.