In this research we introduce new classes of a generalization on a certain class of Salagean-Type harmonic univalent functions HP∗(n,µ,δ,we define a differential operator for multivalent functions in the unit disk and we define and investigate a new subclass of salagean-type harmonic univalent functions by using differential operator Dnλ,µ,γ. These subclasses will be mentioned in this research and we will study and investigate their fundamental properties such as: a sufficient coefficient condition , the coefficients estimates, partial sum, distortion bounds and extreme points, convolution and convex combination and many others.