The paper begins with a background of Amin Osaman and his family, education, marriage and his jobs. He became the youngest deputy minister in the finance ministry. Amin had thought that Egypt could obtain all its goals in all the fields by the aid of Great Britain experience. The paper gives a light on Amin's relationship with Al – Wafd party and Al Nahas Pasha the president of that party. He has a role in establishing Al Nahda association 1945. He had a role in the 4th Feb. 1942 crisis and the 1936 treaty. The researcher proves that the main reason of his assassination is his thoughts and opinions besides his good relationships with the British side in Egypt. Finally, he gives us some aspects that the palace presented in King Farouk and his groups who were the responsibility of this assassination.