An overview on the developments of modern fluid mechanics is pre-sented in this article,We have briefly described the main achievements invarious branches of the subject and the contributions to them by great masters inthe mechanics community and by Chinese scientists of older generation,In par-ticular,maturity of computational fluid mechanics, advances in nonlinearmechanics and emergence of new branches are responsible for the formation ofthe features of this period in the last three decades or so,When loo...