Abstrace In this thesis we obtain the sign of the electron charge using 2011-CM data.we give a brief review on the electro properties and introduce the main sources of errors on the sign measurment of the electron charge in the P-P collider .consequently we select the Z-decay to two electron events from 2011-CMS data to obtain the sign of the electron charge.To be certain about the events we compare our results with the Z-decay computer simulation.The obtained results are in a good agreement with the real and simulation data.
