Recent experimental development in high density QCD, majority of which are provided by the experimental studies with the high-energy heavy-ion collisions at RHIC and LHC. A new era in this field has just began with the successful heavy ion run at LHC in November 2010. We can expect abundant new results from both LHC and RHIC in the coming years. In this report, particular emphasis is placed on the introduction of the new results from LHC.