The sword-tip squid is one of the important economic squid resources in the East China Sea. However, the fishery biology characteristics of the feeding ground in the northern East China Sea are still unclear. Based on the samples of the sword-tip squid collected by the trawlers in the northern part of the East China Sea from September 2017 to February 2018 and September 2018 to February 2019, the basic biological traits were studied. Results have shown that the dominant mantle length and body weight group of male individuals are 100-180 mm and 40-160 g(n=309 ind), respectively, and females are 80-160 mm and 40-160 g (n=304 ind), respectively, and there were differences in the mantle length and weight of the male and female individuals over the years. Covariance analysis (ANCOVA) showed that there were significant differences in body weight-mantle length relationship between males over the years (P<0.05), while the female differences were not significant (P>0.05). Male mature length is mainly concentrated on individuals larger than 120 mm, female is large than 140mm, and the tendency of maturation could be seen under a small mantle length. The mantle length and body weight growth rate of female individuals were faster than males, and the weight growth rate of male and female individuals varied greatly from year to year. According to the comprehensive analysis, the populations of the swordtip squid sampled over the past two years were all spawning populations in spring and summer, and the number of larvae in the spawning population in summer of 2018 was large. Therefore, understanding the dynamic biological characteristics of the fisheries of the swordtip squid is the basis of sustainable resource development and fishery management.