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The proton radioactivity half-lives of spherical proton emitters are calculated by the cluster model with the con-tribution of a centrifugal potential barrier considered separately. The results are compared with the experimental data and other theoretical data, and good agreement is found for most nuclei. In addition, two formulae are pro-posed for the proton decay half-life of spherical proton emitters through the least squares fit to the experimental data available, and could reproduce the experimental ha Jr-lives successfully.