The aggregating state of a polymerizable gelator,4,4′-bis (α-methylacryloyloxy-1,3-ethyleneoxycarbonylpropionamido)diphenyl methoane (BMDM),in gelation of diphenyl ether was investigated by using fluorescein as the fluorescence probe．It was shown that the fluorescence spectra of fluorescein in the gels had a red shift in contrast to those in the solution of diphenyl ether and that the gelation thime decreased with increasing the concentration of BMDM. The orientation of organogel was studied by means of polarized fluorescence．It was found during the gelation of diphenyl ether that the isotropic solution (P0=0) of BMDM was transited to an anisotropic sol(P＞0),and finally the anisotropic sol became isotropic gels (Pgel≈0)．