  Recently LHCb experimental group find an exotic state $T^+_{cc}$ from the
process $p\bar{p} \to D^0D^0\pi^+ + X$. A key question is if it is just a
molecule or may have confined tetraquark ingredient. To investigate this,
different methods are taken, including two channel ($D^{*+}D^0$ and
$D^{*0}D^+$) K-matrix unitarization and single channel Flatt\'e-like
parametrization method analysed by pole counting rule and spectral density
function sum rule. It demonstrates that $T^+_{cc}$ is a molecular state, though
the possibility that there may exist elementary ingredient can not be excluded,
by rough analysis on its production rate.
