The dewatered sludge samples were collected in one wastewater treatment plant and the content of Cu was 116.04-316.68 mg/kg and Pb was 13.13-37.02 mg/kg. The influence of temperature, salinity and pH on Cu, Pb solubility in excess sludge was researched. It could be obtained that the release amount(average=0.567 mg/L) of Pb in acid conditions(pH=6.5)was less than that(average=0.641 mg/L) in alkaline conditions(pH=8.5),which was different from Cu(0.063>0.061), but the total release amount of Pb was greater. Temperature had obvious effect on Cu, Pb release, the heavy metals were easier to release along with the temperature increase, and at high temperature it could be quicker to reach the equilibrium concentration. Salinity had significant effect on heavy metal release in excess sludge, the release amount of Cu, Pb increased along with the salinity increase, and the equilibrium concentration was sooner to reach at higher salinity.