A high efficiency 1574 nm eye-safe minitype laser without water or air cooled is reported. It is 30 mm×125 mm in size. An oval lamp-pumped with elliptical cavity was developed, and a rotationally symmetrical heat radiation structure without water or air cooled was designed. The uniformity conduction-cooled of the laser and optic parametric oscillator(OPO) crystal was achieved. By using xenon flash lamp pumped, Cr4+YAG Q-switched Nd:YAG cavity as the pump source, a KTP crystal optical parametric oscillator ( KTP-OPO) system lasing at 1574 nm wavelength was realized. In the experiment, the highest signal output of 21 mJ at 10 Hz within ten pulses was obtained, and the pulse width was about 7 ns, the beam divergent angle less than 6 mrad. The optic-optic conversion efficiency from 1064 to 1574 nm was 30% approximately and the energy stability was better than 5%.