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We propose to use high-energy exclusive reactions for probing internalstructure of exotic hadron candidates. First, the constituent counting rule ofperturbative QCD can be used for finding internal configurations of an exotichadron candidate. It is because the number of constituents ($n$), whichparticipate in the exclusive reaction, is found by the scaling behavior of thecross section $d\sigma/dt \propto 1/s^{n-2}$ at large momentum transfer, where$s$ is the center-of-mass energy squared. As an example, we show that theinternal structure of $\Lambda \, (1405)$ should be found, for example, by thereaction $\pi^- + p \to K^0 + \Lambda (1405)$. Second, the internal structureof exotic hadron candidates should be investigated by hadron tomography withgeneralized parton distributions (GPDs) and generalized distribution amplitudes(GDAs) in exclusive reactions. Exotic nature should be reflected in the GPDswhich contain two factors, longitudinal parton distributions as indicated bythe constituent counting rule and transverse form factors as suggested by thehadron size. The GDAs should be investigated by the two-photon process$\gamma^* \gamma \to h\bar h$, for example $h=f_0$ or $a_0$, inelectron-positron annihilation. Since the GDAs contain information on atime-like form factor, exotic nature should be found by studying the $h\bar h$invariant mass dependence of the cross section. The internal structure ofexotic hadron candidates should be clarified by the exclusive reactions atfacilities such as J-PARC and KEKB.

Internal structure of exotic hadrons by high-energy exclusive reactions