Abstract: Objective To explore the influencing factors of illnesss incident during summer hot spell among bus drivers in Ji'nan city,and to provide basis for implementation of health protective measures.Methods With quota sampling method,a self-administered anonymous questionnaire survey was conducted among 532 bus drivers from Ji'nan Public Transportation Company in September,2012.Results Overall 310(58.3%)bus drivers had illness experiences during the hot time.The differences in prevalence rates among the drivers of different gender,age,with different disease history,health status,monthly income,education background,work years,and bus type were statistically significant(P<0.05 for all).Multiple logistic regression analyses showed that females and chronic disease history were risk factors for illness incident during hot period,with the odds ratios(ORs)of 1.787 and 2.466.The drivers with general,good/very good health status were less likely to fall ill during hot spell than the drivers in poor/very poor health condition,with the ORs of 0.334 and 0.111;the air conditioning system in the bus contributed to reduce the risk of illness incident during hot spell,with an OR of 0.675.ConclusionGender,chronic disease history,health status,and bus type are influencing factors of illness incident among bus drivers in Ji'nan city during hot spell.