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[en] In medical linear accelerator, the energy parameter of electron plays important role to produce electron beam. The percentage depth dose of electron beams takes account not only on the value of electron's energy, but also on the type of electron's energy. The aims of this work are to carry on the effect of energy parameter of electron on the percentage depth dose of electron beam. Monte Carlo method is chosen in this project, due to the superior of this method for simulating the random process such as the transport particle in matter. The DOSXYZnrc usercode was used to simulate the electron transport in water phantom. Two aspects of electron's energy parameter were investigated using Monte Carlo simulations. In the first aspect, electron energy's value was varied also its spectrum. In the second aspect, the geometry of electron's energy was taken account on. The parallel beam and the point source were chosen as the geometry of The measurements of percentage depth dose were conducted to compare with its simulation. The ionization chamber was used in these measurements. Presentation of the results of this work is given not only based on the shape of the percentage depth dose from the simulation and measurement, but also on the other aspect in its curve. The result of comparison between the simulation and its measurement shows that the shape of its curve depends on the energy value of electron and the type of its energy. The energy value of electron affected the depth maximum of dose.