Abstract: Since the test and evaluation methods now available are not adequate for fully assessing the performance of optoelectronic sensors installed on the weapon system platforms, the principle，constitution，function and qualification of the field mobile multifunction optoelectronic testing target are introduced in the paper. The 1.5m×1.5m target is composed of a 7×7 lattice thermal target, a laser diffuse reflection target with wide spectrum and 5 laser detectors with multiorientation and multiwaveband. Applicable laser wavelength ranges is 1.06μm～10.6μm, and the responding time is less than 1ns. The thermotarget pattern, temperature setting, azimuth and pitching of the target are controlled by a PC system. The updown height of the target can be controlled at 2m～8m. If the whole system is mounted on a plain trailer of 3m×5m, it can be used for the performance testing and simulation training of the optoelectronic countermeasure.