The effectiveness of televised violence in aggressive behavior on pre-school children in the Sultanate of Oman has been studied and investigated. The study was conducted at Ibn al-Haytham private school .To achieve this objective, Amayreh (1991) aggressive behavior scale has been applied after being codified to conform the Omani culture and it has been evaluated by a group of arbitrators. The reliability coefficient (0.84%) was extracted by retesting, The scale has been applied for a sample of 50 children which is randomly chosen. They were mixed and divided randomly into equal groups of 25 pupils each. The first group was an experimental one which underwent televised violence program over two weeks for a period of ( 60) minutes per session while the second group- control- was not subject to the program. Mann Whitney (Mann-Whitney) featureless test shows that there was no effect of the televised program of violence in the average scores of aggressive behavior for the experimental group compared with the control group .The statistical result was (a < 0.05) when carrying out the posterior measurement. Also the results of the same test showed that there is no effect of the televised program of violence in the average scores of aggressive behavior for the experimental group compared with the control group and the statistical result was (a< 0.05), when carrying out the following-up measurement. The results so obtained were discussed; analyzed and appropriate recommendations were made.