The chromosome samples of Rana nigromaculata were prepared by peripheral blood lymphocyte cultured in vitro. Karyotype, C-banding and silver-staining nucleolus organizer regions (Ag-NORs) were observed on chromosomes samples. The result showed that: (1) the chromosome number of Rana nigromaculata is 26 (2n=26), i.e., 10 large and 16 small chromosomes, the large chromosomes are matched into 5 homologous pairs and small chromosomes are matched into 8 homologous pairs, and further indicates the karyotype of Rana nigromaculata is bi-modal; (2) Metaphases of female and male were observed separately, the chromosome of No.11 has a pronounced secondary constriction in the middle of long arms. But the position of secondary constriction in the aberrant type individuals is in the middle of long arms of the No.8; (3) it has only one obvious C-banding close to the telomere, which is located in the long arms of the No.5; (4) The chromosome No.11 is a pair of homologous chromosomes with Ag-NORs, and the position of Ag-NORs in female and male is identical.
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