Using dispersing prism and KTP crystal typeⅡphase matching for intracavity frequency-doubling, the Nd∶YAG ceramic laser at the wavelength of 660 nm is studied. Suitable film parameters of resonant cavity reflectors are designed according to 1 319 nm line of Nd∶YAG ceramic, side-pumped Nd∶YAG ceramic crystal with 1.1at% Nd doping and dimensions of Φ3×50 mm. Cavity parameters are designed based on the ceramic thermal focal length. Under repetition rate of 1 000 Hz and single pulse pumped energy of 144 mJ, the output energy of 3.9 mJ at 660 nm is obtained. The optic-optic efficiency is 2.71%. The results form the basis for the further development of the high power high efficiency ceramic red laser.