The laser retroreflectors as a laser cooperative target on satellite are traditionally arranged in circle array. 38 hexagon retro reflectors, each with the effective incident aperture of 30 mm and the height of 25 mm, are designed, thus a light and high stable cooperative target with the size of 280 mm×160 mm and the weight less than 2 kg is obtained. After numerical simulation, a single retroreflector demands the integrated dihedral angle error of 5°±0.5″, considering velocity aberration compensation. So an angle error of each dihedral of ～1″ is introduced deliberately. Such a design increases the machining difficulty of the array floor. But comparing with a traditional design, computation results shows the new compact one decreases 15.5% of the weight, and increases 10.3% of both the effective reflection coefficient and the echo photons at the same dimension.