With the development from scanning mode to staring mode, infrared radiation (IR) optoelectronic system can realize scouting in large field. But it can only get the two-dimensional information of target. If combined with laser active detection, three-dimensional information of angle-angle-distance can be got, which are mutually complementary. A laser active detection technology with pointed function based on two-dimensional piezoelectric fast-steering mirror (PFSM) is proposed and discussed, which realizes the IR imaging /ladar dual-mode detection to track the target with high precision. The field of view and its linearity are analyzed and tested, which accord well with the calculation result.