The impact of flame-flame interactions on the behavior of the diffusion of the methane/air microflame have been examined by changing the burners' distance based on experimentally obtained chemiluminescence images and numerically obtained flow field and oxygen distribution. The behavior of microflames is discussed in the three stages of interactions, where the inclining separated flames, the merging flames, and a merged flame are observed. The present scale analysis has shown that two different scales need to be considered on the transport process in the microflame: one is a fuel-jet scale and the other is a buoyancy scale. Interactions that occurred outside the flame are of significance because they bring the early partial merging of the microflame and the early disappearance of the flame base in between. They need to be considered in the buoyancy scale, and there the buoyancy-driven flow needs to be taken into consideration.