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We extend the one pion exchange model at quark level to include the shortdistance contributions coming from $\eta$, $\sigma$, $\rho$ and $\omega$exchange. This formalism is applied to discuss the possible molecular states of$D\bar{D}^{*}/\bar{D}D^{*}$, $B\bar{B}^{*}/\bar{B}B^{*}$, $DD^{*}$, $BB^{*}$,the pseudoscalar-vector systems with $C=B=1$ and $C=-B=1$ respectively. The"$\delta$ function" term contribution and the S-D mixing effects have beentaken into account. We find the conclusions reached after including the heaviermesons exchange are qualitatively the same as those in the one pion exchangemodel. The previous suggestion that $1^{++}$ $B\bar{B}^{*}/\bar{B}B^{*}$molecule should exist, is confirmed in the one boson exchange model, whereas$DD^{*}$ bound state should not exist. The $D\bar{D}^{*}/\bar{D}D^{*}$ systemcan accomodate a $1^{++}$ molecule close to the threshold, the mixing betweenthe molecule and the conventional charmonium has to be considered to identifythis state with X(3872). For the $BB^{*}$ system, the pseudoscalar-vectorsystems with $C=B=1$ and $C=-B=1$, near threshold molecular states may exist.These bound states should be rather narrow, isospin is violated and the I=0component is dominant. Experimental search channels for these states aresuggested.

Dynamics of Hadronic Molecule in One-Boson Exchange Approach and Possible Heavy Flavor Molecules