The controlled rheology products(CR products) were obtained from the degradation reaction of normal polypropylene resin(blow molding grade) with mixing of organic peroxide in the extruder. Molecular weight distribution and rheological, mechanical and optical properties of CR products were measured according to the peroxide content. Polydispersity index of CR products were decreased from 8.2 to 4 with the increasing the peroxide content. And from the relationship of melt flow rate and intrinsic viscosity, it show that degradation was occured more effective at higher molecular weight portion than the lower molecular portion. The shear stress of CR products was higher than the normal polypropylene which has simillar melt flow rate at low shear rate region, but reverse pattern was showed at high shear rate. High transparency film could be obtained from the controlled rheology of polypropylene with the peroxide mixing, without the loss of stereo regularity, crystallinity, melt flow properties and mechanical properties such as tensile strength and elongation.