Experimental observation of disclinations of main一chain nematic polymers is re-viewed. The geometry of disclination structure is dicussed both from observations of schlieren texture and the theory of curvature elasticity for a two-dimensional case with equal splay and bend moduli. The effects of unequal elastic moduli, the nature of the disclination core and the observation of inversion walls are briefly mentioned. Examples of experimental observation of disclinations of high topological strengths up to s=4 are given. The main experimental methods to map the director field around disclinations are 1) lamellar decoration, 2 ) band-texture decora-tion and 3)surface microcrack decoration. The methods are discussed and compared. Examples illustrated by electron microrrraphs or photomicroeraphs are presented.