Intrinsic viscosity, average molecular weight and its distribution, melt index, melt viscosity and modulus of polypropylenes, prepared from a semibatch slurry process using two types of modified Ziegler-Natta catalyst under various hydrogen pressure, have been determined. Correlations among the measured properties have been made using a linear regressional analysis. Linear correlations independent of catalyst in semilog or full log plot were generally obtained. It was also found that complex viscosity and modulus were more sensitive to molecular weight distribution than the intrinsic viscosity, a dilute solution property, and melt index.