Hadrons are produced from collision and annihilation of electrons and positrons in high energy accelerators. Outgonig hadrons are charged or neutral particles which are detected in detectors. Researchers use these data and analyse them. The data analysed in this thesis are those from the KEK accelerator in Japan. Two methods are used for analyzing events and separating hadronic jets. The first is the cluster method. In the second method, first of all, two-jet and three-jet events are separated from all events by means of Dalitz plot. Using jets axes in two-jet events which are determined by sphericity or thrust, one can predict the spin of quarks. Also three-jet events are used to predict the spin of gluons. Keywords air annihilation, event, quantum chromodynamics, sphericity, thrust, multiplicity, hadronic jet, spin.