CaCO₃ was used as stabilizer to prepare O/W Pickering emulsions. CaCO₃ of different particle size were obtained by ball milling method, and the effects were investigated from the particle size, particle concentration and ratio of water to oil on type, stability, micro-morphology and rheology property of the emulsions. The results indicated that Ball-milled CaCO₃ can stabilize Pickering emulsions, and the emulsion was stable after long-term storage. Particle size of CaCO₃ had effect on the stability of emulsions and drop size of the emulsion increased with expansion of the particle size. When particle concentration was increased, the creaming index, drop size of emulsions decreased, but the viscosity of the emulsions increased. However, when CaCO₃ concentration > 9 g/100 mL, there was little influence of particle concentration on drop size. Emulsion index, drop size and viscosity of emulsions grew with the increase of the ratio of water to oil.