阐述了光声成像的基本原理，综述了现有的几种光声成像方法、原理及成果。介绍了国内外多个研究小组在光声成像领域所取得的一些成果，主要包括：用超声探测器记录光声信号的滤波反投影算法光声成像；超声探测器结合声透镜的傅里叶方法；用探测光做载波调制光声信号，将光声信号转化为光信号，经光学系统解调，将样品像显示在CCD摄像机上的实时光声成像等。对比了几种光声成像方法，并提出了一些光声成像的新思路。

The theory of photoacoustic (PA) imaging is introduced. The existing reconstrution methods, their foundmental and results at home and abroad are summarized. The filtered back-projection algorithm and the Fourier transform method based on acoustic lens, which can realize reconstruction of PA image from the PA signals recorded by ultrasonic sensors are both described. The demodulation of PA signals by optical systems is also introduced. In the optical methods, PA signals are modulated by probing optical beam and turned into optical signals, then it can be demodulated by different optical systems, and finally the sample image can be monitored by CCD camera dynamically. Comparison is made among the different real-time PA imaging methods and some new ideas are proposed.