Abstract The oxygen consumption and ammonia-Nexcretion rates of Chlamys farreri were studied from April to June,1999. The results showed that the oxygen consumption and ammonia-Nexcretion rates of Chlamys farreri were positively correlated with water temperature,and negatively correlated with its body weight under appropriate temperature conditions. Under the test temperature (8～28 ℃),the oxygen consumption rate ranged from 0.48 to 9.09 mg·g-1·h-1, and the ammonia-Nexcretion rate ranged from 0.05 to 1.01 mg·g-1 ·h-1. With the raising water temperature, the oxygen consumption rate reached peak value at 23 ℃,and began to decrease at 28 ℃. The ammonia-Nexcretion rate continuously increased from 8 to 28 ℃. The routine metabolism of Chlamys farreri under treatment was obvious higher than the standard metabolism,and the oxygen consumption and ammonia-Nexcretion rates increased by 35.8% and 75.9%,respectively.