Laser near field detection plays a crucial role in the laser measurement products series and has been successfully and widely applied in lots of field. Traditional laser near field detection system transmits the triggering signal according to the distance information, without being able to judge whether the distance signal is obtained from the target or not. As a result, a false positive could happen and the performance of the system would be weakened. However, recognition based spectral information can improve accuracy. In this paper, a target recognition system, which was compatible for the classical laser fuse scheme, based on spectrum analysis was proposed to increase the detection accuracy of the laser fuse system. Some suggestions about the general design of the improved laser fuse system with spectrum analysis sensor were also offered including active and passive detection with imaging function as an option. Moreover, based on the CMOS technology, a monolithic spectrum analysis sensor was designed and fabricated, which integrated the spectral element on top of the opto-electronical sensor in one chip. Thanks to the greatly reduced size and the weight, this spectrum analysis sensor had potential application in practice. The experiment results show that the capability of such system on chip (SOC) sensor in distinguishing the target from the camouflage.