Aiming at the key problems of laser weapon, laser atmospheric propagation property in low elevation on the sea is researched. Firstly, laser atmospheric propagation property on the sea is analyzed, and atmospheric transmittance of 1.06 μm laser in low elevation is calculated. And then high power laser atmospheric propagation is qualitatively analyzed. In addition, the compensation technology of laser atmospheric propagation is given. Finally, some data and conclusions about 1.06 μm laser atmospheric propagation in low elevation on the sea are presented. It has some extent reference values for research on laser weapon.