Abstract: [Objective] The candidate mutants of maize ZmCIPK23 gene were continuously backcrossed and self-pollinated with B73 in fields, and finally homozygous mutants with B73 background were obtained, which laid the material foundation for studying the function of this gene.[Method]The candidate mutants of ZmCIPK23 were screened from a maize Mutant library.They were planted and analyzed by nested PCR.The positive plants with Mu-insertion in the ZmCIPK23 gene were self-pollinated and backcrossed with B73 in the field.Thus the homozygous mutants were obtained.[Result]The homozygous mutant of ZmCIPK23 gene was obtained by PCR.[Conclusion]The homozygous mutant (zmcipk23) of Mu insertion of ZmCIPK23 gene was obtained.This study has provided a foundation for the functional analysis of the ZmCIPK23 gene.