The invention relates to an ultrasonic, opto-acoustic and opto-acoustic spectrometry tri-modal imaging system, which is applied to identification of ingredient content and dimension equivalent of a tissue. The system comprises a host machine, a pulse laser, as well as an array ultrasonic sensor, a data acquisition module, a data processing and image reconstruction module and a display module which are sequentially connected, wherein the host machine is connected to the array ultrasonic sensor and the pulse laser; the array ultrasonic sensor clings to the tested tissues; and the pulse laser is opposite to the tested tissues. Compared with the prior art, the imaging system disclosed by the invention has the advantages of achieving tri-modal imaging as well as synchronous and equal-proportion imaging and the like.