To study the growth and development law of Cyperus esculentus, the growth process of round Cyperus esculentus Jisha2 was observed. The growth process of tiller number, plant dry weight, tuber number and tuber dry weight were fitted using the Logistic equation to obtain the Logistic growth model and phenological parameters. The results showed that the growth dynamic law of different growth indexes of Cyperus esculentus was basically consistent, showing an "S" type growth curve, and the fitting determination coefficients were all above 0.987 7. Each growth index entered the linear growth period 25 days after sowing, and entered the slow growth period 85 days after sowing. The growth in the linear growth period accounted for more than 55% of the total growth. Logistic equation can be used to accurately fit the growth law of Cyperus esculentus. It is suggested that fertilizer and water management should be strengthened during the linear growth period of Cyperus esculentus to increase the linear growth and improve the yield and quality of Cyperus esculentus.