In order to improve the fire density and hitting effect during formation of naval gun firing on shore, research on the multiple round simultaneous impact. According to characteristic for formation of naval gun to fire on shore, get relative coordinates of friend or foe based on formula of Gaussian medium latitude formula, and put forward the projectile’s flying time by solving ballistic equations, then the multiple round simultaneous impact on target can be realized by control launching sequences and launching intervals correctly, and carry our application analysis by solving naval gun shooting data. Application result shows that the research holds good practical value, and it can provide reference for commander to make decision during firing on shore.