Objective   To discuss risk factors due to rotavirus diarrhea.

  Methods   To select 63 hospital controls and 74 community controls which were matched cases for sex and age within one months in Suzhou were to analyze risk factors for rotavirus diarrhea.

  Results   Breast-feeding before 6 months(OR=0.147, 95%CI: 0.028-0.764)and more area in housing(OR=0.22, 95%CI: 0.09-0.54)was protective factor, then breat-feeding after 12 month(OR=3.278, 95% CI: 1.554-6.931)did not decrease infective rate of rotavirus diarrhea; there was significance that younger mother(OR=41.89, 95%CI: 2.56-68.6;OR=12.77, 95%CI: 1.58-103), elder nursing(OR=1.139, 95%CI: 2-65.31)may be increase rotavirus diarrhea in the suburb and rural. Further, there was vulnerable to infect rotavirus diarrhea by going outside often(OR=21.676, 95%CI: 1.042-6.821).

  Conclusion   At a certain extent breast-feeding may cut rotavirus diarrhea rate down, but there should not continue to feed too long. It may be the major risk factor that infants and children touch environment impurity.