In biological evolution research area, the embryo and larva of sea anemone are important experimental animal to find the bilaterian evolutionary developmental ancestor. Based on the early developmental process and morphological characters of the sea anemone, Cereus sinensis, in the laboratory, it’s embryo development, planula stage, larval settlement and juvenile polyp developmental stages were described in this study. At the each stage, the changes of morphological characters, shape size and inner structure of zygote, egg cleavage, planula larval and polyp was observed along with the early developmental sequence. Photo picture was recorded in the study to present the live status. The difference of larval settlement between sea anemone Cereus sinensis and jellyfish Rhopilema esculentum was discussed. The comparison on early development of Cereus sinensis with three other species of sea anemones was made to elucidate the distinction of tentacle eruption. The process of metamorphosis from the oocyte to the 16 tentacles juvenile polyp of the sea anemone Cereus sinensis was illustrated.