Acoustic-resolution photoacoustic microscopy (AR-PAM) with dark-fie ld confocal illumination can be used to obtain high-resolution images of the absor ber in the deep tissue.However,most current systems use complex optical components for illumination,and require highly sensitive alignment.This paper introduces a si mple AR-PAM in dark reflection mode based on fiber for illumination.9pieces of fib er are uniformly distributed around the ultrasonic transducer,and the angle between eac h fiber and the center axis of acoustic transducer is 45°.The pulsed laser transmitted into the interior of the sample by fiber forms the circular focusing area with dark cente r, coinciding with the focal plane of acoustic transducer and achieving dark-field confocal photoacoustic imaging.In this system,the center frequency of the acoustic trans ducer is 50MHz,the bandwidth is 30MHz,the focal length of the sound lens is 4.1mm,and the F-value is 1.4.From the scanning image of printing black grid with 200μm width and rat ear obtained by the system,the black grid width of the scanning image is consistent with the actual width,and the vessel of the scanning po sition could be clearly distinguished from the surrounding tissue.The results show tha t this system has high resolution and contrast and large imaging depth.