Abstract: An indoor static system was employed in this experiment to measure the energy budget of Ruditapes philippinarum at temperature of 3 .. , 5 .. , 8 .. and the effect of tissue weight on the oxygen consumption rate (OCR) and ammonia excretion rate ( AER) . The result showed that the OCR and AER had the negative correlation with the t issue weight. The temperature had positive inf luence on the ingestion rate and growth rate (K1 and K2 ) of clam. Temperature had great effect on the rat io of energy. The temperature had positive influence on the energy ratio of growth, had negat ive influence on that of respiration and ejection. At the equat ions of the energy budget of clam, the ratio of growth, respiration , ejection and excretion comprised 6. 13% - 34. 63%, 23. 37%- 32. 73% , 41. 131% - 60. 69%, < 3% respect ively of the total energy.