NGOs have arrived at International Relations. Since the 1980s economic globalization, revolution in information technologies, and the emergence of non-traditional security issues, among others, have led both researchers and practitioners of international relations to closely examine the role of NGOs. The fact of matter is very simple. In dealing with international problems of increasingly global or transnational in nature, the states have to seek the assistance of NGOs, in addition to the cooperation from other states. The study of NGOs in international relations is still at its developing stage. This article provides a survey of state of research on NGOs in international relations. Four specific issues will be examined: the concept of NGOs, international relations theory and NGOs, major research topics in NGOs studies, and the implications of NGOs for international relations. Our study reveals that the lack of scholarly interests and the inattention to theoretical framework have defined and circumscribed NGOs research in the field of international relations. To fully incorporate NGOs into international relations research agenda will be not only necessary but also very rewarding.