The growth models of the diameter, wrist length and weight of the moon jellyfish medusa in Yantai waters were studied in this present study, and the development of radial canals was observed in details for the first time. Our results showed that the cultured moon jellyfish (15-150mm of the umbrella-part diameter) displayed a power function growth equation between weight and diameter, and a linear relationship between the wrist length and diameter. The growth curve equation of diameter of Aurelia aurita is Dt = 4×10-6t4- 0.0014t3 0.1087t2 0.5079t 9.428 (R2=0.9993). The perradial canals and interadial canals appeared in the newly released ephra. The adradial canals formed in the 3-day ephyra. And the Ring canal formed in the 11-day ephyra with the divergences. The number of convergences and divergences increases with the development of the moon jellyfish medusa diameters. Moreover, the maximum number of convergences and divergences in 1/4 umbrella of mature moon jellyfish medusa was 66 and 32, respectively.