In mid-October 2017, Craspedacustas was found in a pond in Fuquan County, Guizhou Province. It was identified as Craspedacusta sowerbyi by molecular analysis. We observed its growth and testicle development process, then established correlations between width of velum, width of mouth and number of tentacles with its umbrella diameter respectively. As shown in Fig. 1, the female tentacles were slender and extended upward, while the male tentacles were tubbiness-like and vertically downward. In the correlation function analysis as shown in Fig. 5﹣7, R2 values were 0.78, 0.92, 0.92 respectively，r values were 0.88, 0.96, 0.96 respectively, suggesting that there are strong positive correlation between the width of velum, width of mouth, number of tentacles with its umbrella diameter. But remarkably, when the umbrella diameter is greater than or equal to 12 mm, the changes of the three factors are not obvious. The growth of testicles is also consistent with this conclusion. Therefore, when the diameter is less than 12 mm, meaning C. sowerbyi is in developing stage, and the width of velum, width of mouth, number of tentacles and testicles increased with the increase of its diameter, while when the diameter is greater than or equal to 12 mm, the above characters are relatively stable and have little change with the increase of its diameter，meaning that Craspedacusta sowerbyi is in the maturation stage.