In order to solve the technical bottleneck of the sensitive detection of the optically detected magnetic resonance (ODMR) signal from the nitrogen vacancy (NV) color centers in the diamond by taking the advantage of the directional amplification of stimulated radiation, an optical amplification system was set up to investigate the stimulated radiation of NV color centers in diamond, where the maximum amplification efficiency reached 10.5%. Besides, it is found that the amplification efficiency is related to the pump laser power and signal laser power as well as the polarization states of the two lasers. The results show that it is promising to use the amplification of stimulated radiation to replace the fluorescence in the ODMR measurement with NV color centers in the application of remote sensing.