The paper studied the effects of different temperatures ( 10,15,20,25,35 ℃) on physiological characteristics of Plagiognathops Microlepis Bleeker. The results showed that the rates of ingestion,digestion,respiration and suffocation point of Plagiognathops Microlepis Bleeker significantly increased with temperature ( P < 0. 05) . In addition,ammonia excretion rates in both fasting and over fed Plagiognathops Microlepis Bleeker increased with temperature and reached the peak at 25 ℃. At the same temperature,ammonia excretion rate of over fed Plagiognathops Microlepis Bleeker was greater than the rate of the fasting Plagiognathops Microlepis Bleeker ( P < 0. 05) .