In-depth study of the interactions occurring between emulsion droplets is important to a range of applications from the food and pharmaceutical industries to oil recovery and mineral flotation. The traditional method of studying the stability of dispersion system is mainly based on the judgement of macroscopic properties of large number of particles. However，it is not mature to study the stability mechanism of emulsion by studying the interaction force between single droplets. The stability mechanism of emulsion can be directly elaborate by measuring the interaction force between monodisperse droplets. Based on the classic DLVO theory，the model of steric repulsion and depletion attraction，the surface force apparatus，atomic force microscope， total internal reflection microscope and optical tweezers were used to directly determine the interaction force between liquid and liquid interface. In this paper，the feasibility，principle and characteristic of the above measurement technologies applied to measure the interaction between droplets in emulsion were mainly reviewed，the advantage and disadvantage of different test methods for measuring the interaction force between droplets were compared，which provided reference for further research on the microscopic mechanism of emulsion stability.