According to the characteristics of divergence angles in far field from 650 nm laser diode lightsource used in laser range finders and integrated with the theory of aspheric optics design, the image aberration ofthe aspheric collimating lens is simulated and calculated by ZEMAX software and the optimum design is per.formed. The aspheric collimating and shaping system is designed. The system data, spot diagrams, characteristiccurves of transverse ray aberration and simulation diagrams are given. A design method which uses the asphericlens collimating system to compress and collimate the divergence angles of laser diodes is given. The calculationresult indicates that the maximum divergence angle after collimated and shaped is compressed into 0.199 9 mrad.The relative light patch becomes more uniform and the energy efficiency is improved. The given optical systemhas the characteristics of simple structure, easy to produce, excellent spherical aberration correction ability, highimaging accuracy and easy to use.