Abstract: The kinetic behavior of polymerization of 1-octcne in n-heptane based on α-TiCl₃-AlEt₃ (or -Al(i-Bu)₃, -AlEt₃Cl) catalysts was studied. The rate curves could be divided into 1 to 3 stages and corresponding₁ to 3 stationary periods, in which the stationary rates increase in the approximate ratios 1:2:4, The phenomenon was caused by the corresponding stair-like rising of the number of active centers, and was suggested to be the result of the breaking of TiCl₃ crystals under the effect of propagating chains.