Strontium nitrate as an additive was added in the system to prepare uniform distributed broccoli ⁃ like calcium carbonate particles. The one ⁃ step synthetic method was used which is safe and environ ⁃ ment ⁃ friendly. The resulting calcium carbonate was characterized through scanning electron microscope(SEM), X ⁃ ray iffraction(XRD) and energy dispersive X ⁃ ray analysis(EDAX). Meanwile, the possible reaction mechanism of calcium carbonate was put forward.