]To meet the cruise missile's air-to-surface attack requirement,  specified impact angle guidance law is presented based on line of sight (LOS) information framework.  Theoretical analysis proves its property.  Considering the missile autopilot's dynamics,  a simple engineering version of integrated guidance and control synthesis is deduced to improve performance.  Mid-course trajectory characteristic is utilized to obtain smooth and low-delay vertical velocity to calculate trajectory angle.  Finally mathematical simulation demonstrates their effectiveness.