A dual-mode imaging system and a dual-mode imaging method. The dual-mode imaging system comprises an imaging probe, an ultrasonic component, an optical component and a signal collection unit, wherein the imaging probe is connected to the ultrasonic component and the optical component respectively; a distal end of the imaging probe is provided with an ultrasonic transducer for transmitting and receiving an ultrasonic signal, and an optical focusing member for transmitting and receiving an optical signal; the ultrasonic component comprises an ultrasonic transmitting and receiving module; the ultrasonic transmitting and receiving module is connected to the ultrasonic transducer; the optical component comprises a light source, an interferometer, a reference arm and a photoelectric detector; and the signal collection unit is connected to the ultrasonic transmitting and receiving module and the photoelectric detector. The dual-mode imaging system and the dual-mode imaging method realize simultaneous collection and real-time display of ultrasonic and optical images, reduce costs, facilitate industrialization, support simultaneous ultrasonic and optical imaging, or independent ultrasonic imaging or independent optical imaging, and are more accurate in terms of clinical diagnosis and treatment.L'invention concerne un système d'imagerie à double mode et un procédé d'imagerie à double mode. Le système d'imagerie à double mode comprend une sonde d'imagerie, un composant ultrasonore, un composant optique et une unité de collecte de signal, la sonde d'imagerie étant connectée respectivement au composant ultrasonore et au composant optique ; une extrémité distale de la sonde d'imagerie est pourvue d'un transducteur ultrasonore pour émettre et recevoir un signal ultrasonore, et d'un élément de focalisation optique pour émettre et recevoir un signal optique ; le composant ultrasonore comprend un module d'émission et de réception ultrasonore ; le module d'émission et de réception ult