In order to study the processing performance of microphase separated polypropylene thermoplastic elastomer (MS-PTPE), the paper mainly investigates and explores the effects of polypropylene (PP) molecular weight, rubber plastic ratio, two rubber ratios, initiator and bridging agent dosage on the rheological properties of the melt. The results showed that the melt flow rate (MFR) of MS-PTPE samples gradually decreased with the increase of molecular weight of PP. As the rubber content increases, the melt mass-flow rate (MFR) gradually decreases. When the total content of the two types of rubber is constant, the MFR gradually decreases with the increase of butadiene styrene rubber content. As the amount of initiator increases, MFR rate of MS-PTPE samples gradually decreases. When the amount of initiator is 2.28 phr, MFR slightly increases. As the amount of bridging agent increases, the MFR of the sample gradually decreases. Under the shear flow conditions of this study, the melt of MS-PTPE sample exhibits a flow pattern of pseudo plastic fluid. The relationship between apparent viscosity (η _a) and shear rate ( \dot{\gamma }) and temperature (t) of MS-PTPE sample melt is more intuitive and realistic by the equation η _a＝A＋kt.