This paper aims to explain and analyze the formulation of Indonesia's foreign policy in China's unilateral claim to the North Natuna Sea area. This claim is based on China's argument that this area is a traditional Chinese fishing area. This paper uses a qualitative method of analysis with analysis data collection techniques. References. The results obtained are that the formulation of Indonesia's foreign policy model on China's claims in the North Natuna Sea area uses a diplomatic approach. This is relevant to Indonesia's character as a middle power country. Middle power democracy has always been a catalyst, facilitator and manager in resolvingregional or international conflicts. This condition is also in theory consistent with the foreign policy model designed by John Lovell, namely using the accommodation method. Furthermore, this condition is also consistent with the character of foreign policy in Mandala theory called Asana.