The Large Hadronic Collider will provide 14 TeV proton-proton beams and nucleus-nucleus collisions with the energy of 5.5-7 TeV/nucleon. High multiplicity events and high luminosity will force one to work in the condition of the strongly occupied tracker and calorimeter detectors. The development of methods of jet finding and jet energy correction which are tolerant to the occupancy and nonlinearity of calorimeter response is extremely important. Jet reconstruction and correction in CMS detector in pp and heavy ion events are considered. The main attention is payed to the new perspective method to correct jet energy using combined information from calorimeters and tracker detectors and to the background subtraction algorithm. A set of measurements that can be carried out in the case of heavy ion collisions, such as jet quenching and quarkonia suppression, are presented. Dimuons from U and J / w resonances, as hard jets and photons, can be observed with enough statistics, efficiency and purity in heavy ion collisions.

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