In order to meet the high resolution、high accuracy of environmental detection,to improve the detection ca-pability in complex environment and to solve the problems that the conversion speed of the optical path was slow for multi-band optical system and there were differences in the object information of different bands,an optical system that features visible light,medium /long-infrared light,shared aperture,con-focal was designed.The system can receive target informations of three bands at the same time.The focal length for visible、medium /long-infrared light is equal by focal length compensation,which improves the consistency of target information for three bands.The focal length is 1 2 mm and field of view is 36°.The transfer function value is >0.53 for visible light at 80 lp /mm Nyquist frequency;the transfer function value is >0.5 for mid-infrared light at 20 lp /mm and the transfer function value is >0.36 for long-infrared light at 20 lp /mm.The system has an excellent overall image quality and is athermal for temperatures between -40 °C and +60 °C.%为满足系统对环境探测的高分辨力、高准确性，提高光学系统在复杂环境下的探测能力，同时针对多波段光学系统光路转换速度慢、不同波段目标信息存在差异的问题，设计了一种可见光、中／长波三波段共口径、共焦距光学系统。三个波段共用一组光路，系统同时接收可见光、中／长波三个波段的目标信息，通过焦距补偿使得三个波段焦距相等，提高三个波段目标信息的一致性。系统焦距为12 mm，视场为36°，可见光波段在奈奎斯特频率为80 lp ／mm 时传函值高于0.53，中红外波段在奈奎斯特频率为20 lp ／mm 时传函值高于0.5，长红外波段在奈奎斯特频率为20 lp ／mm 时传函值高于0.36，系统整体成像质量良好，在－40～60℃温度范围内对系统消热差。
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