Polypropylene (PP) was modified by grafting of maleic anhydride(MAH) and blending of ethylene-methacrylic acid (EMAA) copolymer in biphenyl solution at $170^{circ}C$. The films were examined by $^{13}C$ NMR, FT-IR, contact angle measurement and adhesion test in various MAH and EMAA copolymer compositions. The transition temperatures of the films remained constant irrespectively of MAH and EMAA copolymer compositions. From NMR and FTIR spectra the grafting of MAH onto PP backbone was checked. With contact angle measurements, it could be confirmed that the grafting of MAH and adding of EMAA copolymer onto PP made its surface more polar. Through the adhesive force evaluations, the value of peeling strength gave the maximum at the 1wt% of MAH and 0.5 wt% of EMAA copolymer.