A tunable LiF:F2 color center laser using 0.53μm laser as the pumping source is reported. In this experiment, the concentration of F2 center in crystal is about 6.2×1017 cm-3, a value higher than that previously reported. The linewidth of the tunable laser output around 0.69μm is 1.5 A with an energy conversion efficiency of 2.9%. There were no bleaching effects in crystal until 6000 pulses have been shot.