Long chain branched polypropylene (LCB-PP) was prepared using reactive extrusion process in the presence of various peroxides, a multifunctional monomer of 1,6-hexanediol diacrylate (HDDA) and tetraethyl thiuram disulfide (TETDS) as free radicals capture 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 HDDA. 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 peroxide used. Peroxides with lower decomposition temperature and more stable radicals after decomposition promoted the branching reaction, leading to the LCB-PPs with higher branching level and melt strength.