Objective To analyze the relationship between the direct signs of invasive ductal carcinoma and the metastasis in the mammography.Methods 21 7 patients with invasive ductal carcinoma in the mammography were divided into four groups:mass with calcification group,mass without calcification group,calcification without mass group and the group without both mass and calcification. The correlation between metastasis and the size and shape of mass or calcification was studied.Results The rate of metastasis in the group with mass and calcification was 56.31%,and the percentage of the skin and nipple depressed in this group was 38.83%,both of whom were highest (P =0.004 and P =0.043)among four groups.The rate of metastasis in mass group was higher than that in the group without mass (46.27% vs 18.75%,P =0.033).Meanwhile,the edge burr and lobulation of the mass didn’t exert remarkable influence on the rate of metastasis (46.70% vs 25.00% and 43.37% vs 52.00%,P =0.389 and P =0.348).The probability of me-tastasis in the calcification group was higher than that in noncalcification group (53.57% vs 34.29%,P =0.001 ).However,in the calcification group,the different shapes of calcification did not result in significant difference in the rate of metastasis (51.19% vs 60.71%, P =0.382).In the 201 patients with breast cancer mass,the size of mass did not correlate with metastasis [(81.04±1 1 9.45)mm3 vs (70.06±208.30)mm3 ,P =0.654].The masses with lobulation were bigger than others [(7 6 .5 0 ± 1 7 4 .1 3 )mm 3 vs (8 .3 9 ± 1 0 .2 7 )mm 3 ,P =0.000],while the masses with edge burr were smaller than those with smooth edges [(52.10 ±85.90)mm3 vs (144.75±304.13)mm3 ,P =0.038].There was no significant correlation between the size of mass and the calcification [(80.39 ± 126.62)mm3 vs (69.63±209.12)mm3 ,P =0.660].However,the masses with point calcification were larger than those with both point and worm calcifications [(92.79±137.21)mm3 vs (41.71±94.58)mm3 ,P =0.041].Conclusion The mass and calcification in the mammography are valuable for judging the malignant degree of invasive ductal carcinoma.