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The current work presents an analysis algorithm for the modal analysis for the dynamicbehaviors of ofshore structures with concepts of mas perturbation influence term. The mas perturbationconcept by using the term, presented in this paper offers an efficient solution procedure for dynamicalresponse problems of offshore structures. The basis of the proposed method is the mas perturbationinfluence concepts associated with natural frequencies and mode shapes and mas properties of the givenstructure. The mathematical formulation of the mass perturbation influence method is described. Newsolution procedures for dynamics analysis are developed, followed by illustrative example problems,which deal with the effectiveness of the new solution procedures for the dynamic analysis of offshorestructures. The solution procedures presented herein is compact and computationally simple.