The optical absorption of exogenous contrast agents in conventional photoacoustic imaging is mainly concentrated in the visible region and the traditional near infrared region (NIR, 750~900 nm). The development of nearinfrared-II (NIR-II, 1 000~1 700 nm) nanoprobes with higher optical tissue penetration depth is of great significance for photoacoustic imaging of deep tissue in vivo. In this paper, semiconductor singlewalled carbon nanotubes with optical absorption peaks of about 1 000 nm were selected as the exogenous contrast agent for nearinfraredⅡphotoacoustic imaging. The strong photoacoustic effect was tested under nearinfraredⅡlaser excitation. Furthermore, the deep photoacoustic imaging of the phantom tissue was obtained by embedding the nanomaterial in different depths of the tissuemimic phantom. The imaging depth can reach 1.5 cm. Experimental results show that semiconductor singlewalled carbon nanotubes (SWCNTs) with nearinfraredⅡ optical absorption have great potential in photoacoustic imaging of deep tissues in vivo. 