We studied shape change and molecular reorientation of a main-chain liquid-crystalline elastomer, which was composed of smectic main-chain liquid-crystalline polyesters, in a cyclic heating-cooling process with the liquid-crystaline (l.c.)-to-isotropic (and/or isotropic-to-l.c.) phase transition temperature.  The sample used was a uniaxially oriented liquid-crystalline elastomer, which was obtained by uniaxial deformation during a cross-linking reaction in which the sample length of the elastomer became about 8.5 times.