Abstract: The solubility of basic cobalt carbonates from different sources in acid and basic water solution was studied. The crystal structure, thermal properties and pore structure were characterized by XRD, TG and BET, respectively. The results show that the water solubility of different basic cobalt carbonates is very different, the solubility of basic cobalt carbonate in acid solution is better than in basic solution. The difference in physico-chemical property of different basic cobalt carbonates influences the water solubility obviously. It is concluded that the salts with high surface area, large pore volume and high purity will have better solubility and Co3O4 existing in the salt affects the water solubility of basic cobalt carbonate significantly.