To understand the reproductive traits of the wild population of Conger myriaster， this study used external morphological characteristics， gonad histological observation， and a morphological index system analysis to investigate the annual changes in the reproductive biology of Conger myriaster in the East China Sea waters near Shengsi， Zhejiang. A total of 235 individuals of Conger myriaster were collected from October 2017 to October 2018. The results showed that Conger myriaster is distributed in the waters near Shengsi， Zhejiang throughout the year. Individuals with a total length of 494-631 mm and a body weight of 140-390 g accounted for 79.1% of the total number. The average body weight， total length， condition factor， and gonadosomatic index （GSI） of Conger myriaster were highest in January 2018 and lowest in April 2018， while the hepatosomatic index （HSI） was highest in April 2018. Among the 235 samples collected over the year， only one male （0.43%） was found， and six juvenile fish without gonads observed could not be sexed. The male was still in the spermatogonial stage， while the oocytes of the females were in the perinucleolar to secondary yolk globule stages. The females in the perinucleolar and oil globule early stages accounted for 21.28% and 61.70% of the total number， respectively. The oocyte diameter was 51.12-167.73 μm， and the nuclear diameter was 26.71-83.42 μm. The analysis showed that the condition factor of female Conger myriaster increased significantly （P<0.05） from the perinucleolar to the secondary yolk globule stage. This study provides detailed basic information for the resource assessment and artificial propagation of Conger myriaster.