An overview will be given of the programme studying heavy quark bound state production and properties with the ATLAS detector at LHC, with the emphasis on the fitting techniques and statistical methods used in the analyses. Topics include the measurement of J/psi and Upsilon production from various sources, as well as the measurements of the production of chi_c and psi(2S) states. A special attention will be given to the first discovery of the LHC -- the chi_b(3P) state, discovered in 2011. ------------------------------------- Vakhtang Kartvelishvili Lancaster University