  We investigate the singularities and boundedness of a special kind of
algebraic varieties so-called stable minimal models, which are constructed and
studied by Birkar. Given a klt stable minimal model with bounded relative
volume, if we fix the dimension, Iitaka volume, and a DCC set controlling
coefficients, then we show that the singularities of the klt stable minimal
model can be controlled uniformly. Furthermore, we prove that with certain
bounded data, stable minimal models with klt singularities form a bounded
family.
