Abstract: Zigzag Emitting Array Syntheic Aperture (ZEASA),a new model of the acoustical imaging,is presented and discussed in thepaper.The imaging system of this model has not only enough emitting energy for underwater acoustical imaging but also a large field of view.Its scanning speed is high and its cost is relatively low.The form of the point spread function of the system is given.It is found that if the system parameters are controlled properly,the major lobe of the point sprfead function is similar to that of the system with a squaire receiving array,while the side lobes along the axis direction of the linear receiving array are lowered.An imaging system with a 64-element linear receiving array and a 64-element zigzag emitting array is simulated and the analysis of ZEASA is proved to be correct by the results of the simulation.