  In high energy scattering, multiproduction process is unique in its relevance
to the total cross section and in its global property such as rapidity and
other kinematic distributions. If there is hard interaction, the jet rate and
structure is a good arena of perturbative chromodynamics. However, once any
hadron is specified, its property and structure must make sense while the
global and/or perturbative chromodynamics mechanism still can put important
constrains. The relation of the hadron property and structure with its
production cross section, distribution etc. can be much more complex than its
decay width. In one hand there are many difficulties and challenges in
calculation; on the other hand, production process provides unique way to study
the details of property and structure of the hadron, which is beyond the
approach of its decay process. Here I review our works on such topic in recent
years, mainly on the multiquark state production in multiproduction process and
the Bethe-Salpeter wave function in exclusive process. For the former, I
emphasize on the unitarity of hadronization process and relevant models, so
that Almost No multiquark state is observed in multiproduction process; I also
address how to calculate hadron molecule production in multiproduction process;
the most recent observed $T^+_{cc}$ is also stated with its relevance to colour
and baryon number fluctuation of the preconfinement clusters. For the latter, I
emphasize the Dirac structure of the hadron-quark coupling vertex.

High Energy Physics - Phenomenology