A fast photoacoustic (PA) imaging system based on multi-element linear transducer array and phase-controlled focus method was developed and tested on phantoms. A Q-switched Nd∶YAG laser operating at 532 nm and pulse width of 7 ns was used in our experiment as thermal source. The multi-element linear transducer array consists of 320 elements. By phase-controlled focus method, 64 signals, one of which gathered by 11-group element, make up an image. Phantom experimental results can reflect the distribution of the optical absorption correctly. Compared to other existing technology and algorithm, the PA imaging based on transducer array was characterized with speediness and convenience. It can provide a new approach for tissue functional imaging at vivo, and may have potentials in developing an appliance for clinic diagnosis.