After DPRK's fourth nuclear test and the launch of the satellite, China and the United States stand on the opposite for the concrete measures of imposing sanctions on DPRK. Through repeated consultations, these two countries reached a limited “agreement” and the UN Security Council finally passed the resolution 2270 which expended sanctions against DPRK. The relations between China and DPRK raised concerns once again. As is known to all, China and DPRK established alliance relations in the form of treaty in the early 60s of last century. After the end of the cold war, the relationship between them began to fluctuate with ups and downs. And due to the continuous upgrading of the DPRK’s nuclear issue and the improvement of China-ROK relations, the China-DPRK alliance relations become “ambiguous”. In the future, under the circumstances of the game between superpowers is becoming increasingly fierce , the prospect of the unification of the Korean Peninsula is still not clear and DPRK’s nuclear program has not been stopped, China and DPRK should maintain the "alliance" relationship or turn to the normal state relations? The decisive factor depends on the nature of state interests and the essential requirement of geopolitical competition. China-DPRK ambiguous alliance is still likely to continue.