A fixing mechanism includes a base, a stud and an elastic clamping member. The base is arranged at a side of an object. The base includes a through hole defined therein. The stud includes a threaded hole defined therein. The stud includes a cap portion received in the through hole and a main body passing through the through hole. An engaging groove is defined in a surface of the main body. The elastic clamping member includes an annulus end surface, and a truncated cone surface extending from an inner edge of the annulus end surface. The annulus end surface is pressed against onto with the base. A number of gaps are radially arranged in the truncated cone surface thereby defining a number of clamping portions between the gaps. The clamping portions are engaged with the engaging groove thereby cooperatively clamping the stud.