  We introduce a kind of entangled state---photon-addition two-mode squeezed
thermal state (TMSTS) by adding photons to each mode of the TMSTS. Using the
P-representation of thermal state, the compact expression of the normalization
factor is derived, a Jacobi polynomial. The nonclassicality is investigated by
exploring especially the negativity of Wigner function. The entanglement is
discussed by using Shchukin-Vogel criteria. It is shown that the photon-addtion
to the TMSTS may be more effective for the entanglement enhancement than the
photon-subtraction from the TMSTS. In addition, the quantum teleportation is
also examined, which shows that symmetrical photon-added TMSTS may be more
useful for quantum teleportation than the non-symmetric case.
