Raman pulse sequences are generally used to coherently manipulate the atomic wave packet in an atom interferometer. High power Raman beams allow more atoms join in the velocity-sensitive stimulated Raman transition, and that will be helpful for obtaining high signal to noise ratio in atom interferometer fringe. Development of high power Raman laser is important for cold atom interferometer experiments. The experimental realization of high power Raman lasers are demonstrated based on injection locking technique. Master laser is modulated by a 1.5 GHz acousto-optical modulator, and the ±1 order diffraction lights are used as seeding Raman lasers. The seeding lasers are injection locked to two slave lasers which are further amplified as Raman beams. The frequency difference of Raman beams is 3.0 GHz, and the detuning range is about 200 MHz.