The flourishing of terrorism in the Sinai Peninsula after the Arab Spring was caused by many reasons. Rigorous natural environment of Sinai，weak control and management brought by the quasi-demilitarized state and lack of order provided a suitable soil for the growth of terrorism. The sharp decline of Egyptian government’s control of Sinai after Mubarak stepped down from power，the impotence of government in counter-terrorist activities and poor management were key reasons for the rise of terrorism in Sinai. Besides，the expansion of ISIS and Al-Qaeda as well as the negative effects of the United States’ counter-terrorism strategy were regarded as the external elements for the development of Sinai terrorism. The flourishing of Sinai terrorism posed a direct threat to Israel’s security and social stability. It undermined the peace treaty between Israel and Egypt，and made the Israeli-Palestinian issue as well as the security situation in surrounding countries more and more complicated. In response，Israel took a series of counter-terrorist measures，such as fortifying Israel’s defense system in its southwestern borders，strengthening security cooperation with Egypt whilst seeking supports from other Arab countries；further deepening counter-terrorism cooperation with its Western allies and adjusting Israel’s foreign policy in the Middle East. Nevertheless，terrorism in Sinai is still out of control and will in a long run remain a threat to Israel’s security. In consequence，pursuing common security through cooperating with Arab countries will be Israel’s new counter-terrorism approach choice.