The combustion and emission characteristics of tung oil, ethanol and diesel mixed fuel under different injection strategies were studied on a common rail direct injection (CRDI) diesel engine. The experimental results show that the ignition delay period of blends are slightly longer than that of 0# diesel, the peak pressure and heat release rate are higher, but the combustion duration is slightly shorter. With the increase of the volume fraction for tung oil and ethanol, the brake thermal efficiency (BTE) increased. The emissions of CO and HC are higher at low load and increase with the increase of both mixing volume fraction. The NO_x emission is lower at low load and slightly higher at high load, and the soot emission greatly reduces at high load. In general, ethanol has a greater influence on engine performance than tung oil.