Objective To investigate the risk factors for children asthma in Baoji city. Method A two-stage stratified cluster random sampling survey methods was used to select 1 029 children under 14 years old from Jintai district,Weibin district and Chencang district in Baoji city for investigating on risk factors of children asthma,χ² test and non-conditional Logistic Regression were used to analyse factors of asthma. Results Univariate analysis showed that the personal history of drug allergy,family history of allergies,cesarean section,room decoration,etc,27 factors at total were statistically significant (P<0.05);Multivariate unconditional logistic regression analysis presented that in the case of no cold or flu,children had sneezing,runny nose,nasal congestion,nasal itching or eye itching phenomenon,and repeated skin itching or joint flexor side rash,allergic rhinitis,allergic symptoms or similar allergies after eating some foods,caesarean,plus protein food within six months,history of using antibiotics,room wall using paint,doors and windows were made from plastic steel,coolingwith natural ventilation in summer,feculae bombycis pillow were independent risk factors for asthma (P<0.05 );Heater useing in winter heating,ventilation or cooling using fans in summer and down duvets were protective factors of asthma (P<0.05). Conclusion There are many risk factors of childhood asthma,children with asthma should avoid exposuring to risk factors,breastfeed was recommended for infants under 6 months;It is great significance for the prevention and control of children asthma.