When the three separated equidistance single-mode cavities were positioned at the three vertices of an equilateral triangle, the characteristic of the tripartite entanglement among the cavities and that among atoms in the system was studied. The situation was considered which three identical two-level atoms are separately trapped in cavities. Each atom resonantly interacts with cavity via a one-photon hopping. The evolution of the state vector of the system was given when the total excitation number of the system equals one. Negativity was adopted to quantify the degree of tripartite entanglement among three subsystems. The tripartite entanglement dynamics among atoms and that among cavities were studied. The influences of cavity-fiber coupling constant on the tripartite entanglement among atoms and that among cavities were discussed. The results obtained using the numerical method show that, the tripartite entanglement among atoms and that among cavities are weakened with increase of cavity-fiber coupling coefficient.