We study the transport property of single C60 molecular transistors with special focus on the situation that other molecules are in vicinity.The devices are prepared using electromigration and thermal deposition techniques.Pure single C60 molecule transistors show typical coulomb blockade behavior at low temperature.When we increase the coverage of molecules slightly by extending the deposition time,the transport spectrum of devices displays a switching behavior in the general coulomb blockade patte.We attribute this unconventional phenomenon to the influence from a nearby C60 molecule.By analyzing this transport behavior quantitatively based on the parallel-double-quantum-dot model,the interaction from the nearby molecule is proved to be of capacity and tunneling coupling.Thermal stimulation is also applied to the device to investigate the effect of local charging environment variation on intermolecular interaction.