Abstract: This paper presents a brief review on the viscoelastic proyerties of composite materials and make an introduction to the research status in this respect.Emphasis is laid on the discussion of the nonlinear viscoelastic constitutive equations and on the predictions of the delayed strength.Some comments are given on the theories and models which relate creep to fraoturc and fatigue.Owing to the difficulties and complexities of the problems courerned and the lack of sufficient experimental verifications,the present author is certain that the deseriptions in this paper is quite superficial,and need to be deepened and perfected.In view of the importance of the research for the design of composite products and their reliable wage,a far more rapid development can be surely experted.To achieve a good understanding of this subject,we must pay more dividend.