102 Armeniaca sibirica resources of the same age with cold resistant in Inner Mongolia region were studied on pistil abortive rate,pollen quantity,pollen vitality,stigma receptivity and self-incompatibility.The results showed that:(1)The pistil abortive rate was lower than 90% for 86.27% resources,and the pollen quantity of single flower was between 1×10⁴ and 5×10⁴ for 73.53% resources.The pollen vitality was less than 50% with short life for 86.27% resources.(2)The stigma had certain receptivity when the bud would be open,and it could maintain a high level in 1~4 days and began to decline in 5 days after the flowering.(3)The fluorescence microscopic observation of A.sibirica showed that the pollen tube length was less than 1/3 of the style after pollination 16 h for 96.08% resources.The pollen tube length was still not exceed 1/3 of the style after pollination 24 h for 74.51% resources,and the pollen tube extended into the middle part of the style after pollination 48 h for 35.29% resources.After pollination 80 h,the pollen tube reached the lower of the style for 50% resources,but the fertilized ovule number was 0.Thus,the A.sibirica resources were essentially self-incompatibility.