The effect of particle size and shape on the orientation of bulk forms YBa2Cu3O7−xhas been studied. Orientation was found in the green pressed sample made of relatively coarse powder (consisted of 50%–200 mesh and 50% −325 mesh), while there was no such orientation found in sample prepared by shaker mill which consisted of fine particles (1.10 &mgr;m). However, after melt processing including a 100 hr anneal at 980 °C in O2, highly oriented surface layers developed on both type of samples.