Thanks to all of you for the helpful advices. <br><br>The Cs pseudopotential on pwscf.org considers only one electron. But more electrons should be considered as valence electrons if I want study the characters of Cs under very high pressure. Therefore, I considered the configurations 5s2 5p6 6s1 for Cs. And then I test the validity of the artificial pseudopotential by simulating the equation of state under low pressure. But the calculated results are not in good agreement with the experiment. <br><br>Anyhow, thank your very much.<br>I will try the other calculation parameters to test the validity of the Cs pseudopotential. <br><br>Best regards,<br><br>Yan Li<br><br><p> 
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