The population growth of freshwater shrimp ( Macrobrachium nipponensis) was studied in Honghu Lake from May 1994 to June 1995. From March to June, the population is composed of shrimps born last year, and mean body length and weight increase monthly. From August to November, the population consists of ones born this year, mean body length and weight are the lowest in August and September respectivelly, afaterwards increase gradually till November. These show the course of alternation of generations.The growth period is devided into two evident stages. For the former stage (from August to November), the growth of males and females are both fit to Logistic curve and the equations are respectivelly：(♂)L_t =6.85/(1+ e^{0.318-0 2386t})W^t =7.50/(1+ e^{2 3854-0 3250t})(♀)L_t=6.25/(1 + e^{0 23720-0.1982t}), W^t =5.79/(1 + e^{2l95l-0.2371t}).For the latter stage (from March to June), the growth fit in von Bertalanffy's equation respectively：(♂)L_t=5.40[l-e^{-1 0600(t-7.3458)}], W_t=3.43[1 -e^{-1 0600(t-7.3458}) ]^3.2127(♀)L_t= 4. 76[1 -e^{-1.5635(t-5.6903})], W_t=2.43[l-e^{-05635(t-5.690,3}) ]³¹⁸⁸⁰,This report also deals with the method on studying the population growth of M. nipponen-sis t how to utilize rationally and protect effectivelly the resources of M. nipponensis.