The Nuclear Deterrent Strategy on Conventional War(NDSCW) has lost its guiding value in NATO’s military strategy since the conventional military strength of Russia has dropped dramatically. However, this strategy has been favored by countries with weaker conventional military power such as India, Pakistan, and especially North Korea. Under such circumstances, it is of theoretical significance to provide a new way of resolving the nuclear crisis on the Korean Peninsula under the circumstance of deducing whether to maintain the strategic equilibrium by using NDSCW. Based on the literature review, this paper deduces NDSCW from the perspective of offensive realism and proves that the strategy may lead to a full-scale nuclear war and harm the strategic equilibrium it claims to value. In addition, it will aggravate the arms race, making arms control and nuclear disarmament difficult to achieve; This paper also puts forward some enlightenment to ease the nuclear crisis in the Korean Peninsula.