Polymerization of propylene vas performed using MgCl2. EtOH center dot TiCl4 center dot ID center dot TEA center dot ED catalyst system in hexane, where internal donor (ID) was an organic diester and external donor (ED) was a silane compound and also triethyl aluminum (TEA) as activator. A new method called isothermal / non isothermal method (INM), a combination of isothermal and nonisothermal methods, was applied to produce the spherical polymer particles. The effects of the INM method and prepolymerization temperature on the final polymer morphology, M-w and catalyst activity were also investigated. The morphology of the polymers was evaluated through scanning electron microscopy (SEM) images. GPC results were used for molecular weight (M-w) evaluation. It was found that the polymers had a better morphology when they were prepared using INM method. (C) 2009 Wiley Periodicals, Inc. Appl Polym Sci 112: 1863-1867, 2009