The pressure-swirl atomizer is widely used for the injectors in liquid rocket engines thanks to its high-performance atomization and broad stability margin range. Spray mixed-interaction is an important area of study especially in cases where the propellant is mixed by spray interaction after an oxidant and a fuel are discharged separately. This interaction of sprays results in a significant modification of the spray characteristics such as the spatial evolution of the sprays. Experiments are conducted using a photographic technique to quantify the merged angle of the interaction region of sprays from two pressure-swirl atomizers. Simplified analytical approaches based on the conservation laws are introduced to predict the merged angle. The analytic results are in good accord with the measured values when the pressure drops of two atomizers are of near equal value. The results show that the merged angle is mainly determined by the momentum flux ratio of two swirled sprays.