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Photon scattering properties in one-dimensional waveguide side coupled to a nanocavity embedded in two atoms with dipole-dipole interaction (DDI) are investigated theoretically.The analytical expressions of the transmission and reflection amplitudes are deduced by using the real-space Hamiltonian.A method to determine the coupling strength of DDI is proposed.Realization of single photon switching by modulation the DDI is investigated.The influence of dissipations on the performance of the single photon switching are exhibited.An asymmetric Fano-type resonance,which can be controlled by the DDI,appears in the transmission spectrum.