Abstract:The production of Alocinma Longicoryjis in Lake Houhu was estimated by two method.Tlie results are: 2.22 g/(m2·a) of wet weight with shell or 0.111 g/(m2·a) of dry weight shell-free by size-frequency method;2.177 g/m2.a of wet weight with shell or 0.109 g/m2·a of dry weight shell-free by instantaneous growth method.The corresponding P/B ratio are 4.0,5.4,respectively.