Abstract: The local normal detonation speed Dn of insensitive high explosive is closely relative to the local total curvature . To investigate the nonideal detonation of JB-9014 rate sticks(95wt.%TATB+5wt.% binder) at low temperature, series experiments were carried out at 30 ℃ with diameters of 10, 12.5, 15 and 30 mm respectively and compared with those at 24 ℃. Wave shape data were fitted with an analytic form, by which Dn() curves were calculated. The results show that for each diameter, wave shapes is slightly flatter in hotter charges than colder ones. For each temperature, waves propagate more ideally as charge diameter increases. When is smaller than 0.05, Dn() curves are concave upward and trace nearly a common path for any diameter and any temperature. When is larger than 0.05, Dn varies with curvature, diameter, temperature and Dn() curves diverge.