Liquid polybutadiene with high unsaturation of pendant vinyl groups are very sensitive for crosslinking reaction compared to other polymer systems. The curing kinetics of LPB over a wide range of angular frequencies at different constant temperatures (130 to 160 °C) have been investigated rheologically using small amplitude oscillatory shear flow experiments. The elastic storage modulus, G', at a constant temperature in the vicinity of the gel point increases abruptly, and the magnitude of the elevation in G was found to be temperature dependent. Similar behaviors have been observed for complex viscosity and loss modulus at identical conditions. The gel temperature (Tgel) and gel time (tgel) were evaluated from the crossover point of G' and G" or more accurately from the temperature at which tan5 is angular frequency independent (i.e., all curves of tan5 at deferent constant angular frequencies coincided and became no longer frequency dependent).