Abstract: Anopheles minimus collected from Yuanjiang, Yunnan Province, were bred with standard methods in lab. The ovarian nurse cells of A.minimus were separated and stained, and the whole polytene chromosomes were photographed under light microscope and compared with A.minimus from Guangxi. 365 samples of ovarian nurse cells were observed. The chromosomes included one telocentric sex-chromosome X, two submetacentric autosomes II（autosome II right arm, 2R and autosome II left arm, 2L） and two metacentric autosomes III（autosome III right arm, 3R， and autosome III left arm, 3L）. The X is the shortest chromosome and the 2R is the longest one. In comparison with the pattern of polytene chromosomes of A. minimus from Guangxi, difference at 12 positions has been found at the parts of arms in banding sequences.

Key words: Anopheles minimus, Ovarian nurse cells, Polytene chromosome