Based on charge-coupled device (CCD) technique for high temperature measurement, laser molten pool in laser cladding for Ni-base alloy powder was measured. Laser cladding experiments of powder feeding method and pre-fabricated powder method were carried out. Shape, size and temperature field distribution of laser molten pool were measured. It is shown that metal powder melt in part with rough molten pool shape when laser power was low than 1100 W. At 1300 W, the x,y dimensions of laser molten pool were 2.8 mm, 2.7 mm respectively with approximately ellipse shape, the average temperature was 1800 K. Its average temperature increased with small increase of shape dimension when laser power increased. Laser cladding parameters were optimized by the measurement results.