This study includes (409)pregnant women elected from patients who have been admitted to the department of obstetrics and gynecology or outpatient clinic belonging to Assad University Hospital in Lattakia during the study period from 01/09/2014 up to 01/09/2015.patients have been classified in tow groups: symptomatic and non symptomatic(109 and 300 patient respectively).It has been diagnosed asymptomatic bacteriuria in accordance with the standard (Edward Kass) at a rate (12%).We found that the age lesser than 30 years, is a risk factor important in the occurrence of urinary infection ,there is no importance for the pattern of work, and most of the cases of the asymptomatic bacteriuria is in the second trimester (14-28 weeks) and multigravida account of (73.9 %) of the group of bacteriuric asymptomatic patients.Study shows that the bacterial urine culture is the golden diagnostic test to detect urinary tract infection in pregnant women, and it also shows the non-reliability of the urinalysis test, because of the high false negativity in the diagnosis of asymptomatic bacteriuria .Escherichia coli was the most common bacterial organisim causing bacterial urinary infections in patients study, by 66.7% for a frank urinary sepsis, and 80.2% for the group asymptomatic bacteriuria .