Long chain branched polypropylene (LCB-PP) was prepared using reactive extrusion process in the presence of various multifunctional monomers (MFMs), dibenzoyl peroxide (BPO) and tetraethyl thiuram disulfide (TETDS) as free radicals capture agent, also known as co-agent. The LCB structure was confirmed by fourier transform infrared spectroscopy (FTIR), dynamic viscoelastic measurements and thermal analysis. compared to the initial linear PP, the LCB-PPs showed lower melt flow rate, increased crystallization temperature and improvement of the melt strenght. The results concluded that TETDS could efficiently control degradation of PP backbone and homopolymerization of MFMs. Meanwhile the efficiency of forming LCB structure on PP backbone could be also increased. The LCB level in LCB-PPs could be also controlled by the structure and properties of the MFM used. The branching efficiency of the relatively shorter molecular chain bifunctional monomer such as 1,6-hexanediol diacrylate (HDDA) was better than that of trifunctional monomers with longer molecular chain such as trimethylol propane triacrylate (TMPTA) and pentaerythritol triacrylate (PETA). The hydroxyl groups in the molecule of PETA were harmful to the branching reaction, which might be attributed to the harm of the polarity of groups to the dispersion of PETA in PP matrix.