报道了在中华绒螯蟹育苗期间二级海水沉淀池和幼体培育池中水温、ｐＨ、ＤＯ、ＮＨ＋４－Ｎ、ＣＯＤＭｎ的昼夜变化，以及幼体不同发育期水温、ｐＨ、ＤＯ、ＮＨ＋４－Ｎ、ＣＯＤＭｎ、ＮＯ－２－Ｎ、硫化物的检测结果。提出氵蚤状幼体最佳换水时间为每日凌晨３：００时。培育池ＣＯＤＭｎ控制范围Ｚ１～Ｚ３期为１０～２０ｍｇ／Ｌ，Ｚ４～Ｍ期为１５～２５ｍｇ／Ｌ。试验期间用漂白粉能有效控制培育池水中的ＮＯ－２－Ｎ。Ｚ１～Ｚ３期采用换水时吸底、Ｚ４～Ｍ期换水时使用推耙来控制ＣＯＤＭｎ、ＮＨ＋４－Ｎ、硫化物含量。检测发现，五月中旬当地沉淀池水ｐＨ普遍偏高，进入氨氮含量高的培育池后使ＮＨ３大幅度增加。因此幼体氨中毒是导致Ｍ期幼体大批死亡的主要原因。 The diurnal variation of water temperature, pH, DO, NH + 4-N and CODMn in secondary sediment and larval ponds of Eriocheir sinensis were reported, as well as the water temperature, pH, DO, NH + , NO-2-N, sulfide test results. Proposed flea larvae best time to change the water every day at 3:00 am. Incubation pond CODMn control Z1 ~ Z3 period of 10 ~ 20mg / L, Z4 ~ M period of 15 ~ 25mg / L. During the test bleaching powder can effectively control the NO-2-N in incubation pond water. In the Z1 ~ Z3 period, when the water was changed, the bottom of the water was sucked up and the water rake was used to control the CODMn, NH + 4-N and sulfide contents during the Z4 ~ M period of water exchange. The test found that in mid-May the pH of the local sedimentation tank was generally high, and NH3 increased significantly after entering the incubation tank with high ammonia nitrogen content. Therefore, larval ammonia poisoning is the main reason leading to a large number of deaths in M-phase larvae.