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 at- mospheric transmittance of 1. 06μm 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. 06μm laser atmospheric propagation in low elevation on the sea are presented. It has some extent reference values for research on laser weapon.