In this paper, first some results of [5] are extended for subadditive separating maps between C(X, E) and C(Y, E), such that E is a unital Banach algebra. Then we give some conditions under which a strongly subadditive map has a unique fixed point. Finally as an application the existence and uniqueness of solution for a nonlinear integral equation is discussed.2010 Mathematics Subject Classification. 45G10, 37C25, 46J10. Key words and phrases. pointwise subadditive-strongly subadditive map-fixed point-integral equation.yousef estaremi