Survey of the roof rat Rattus rattus (Linn.) by live traps in the three different locations, (houses, granaries and poultry farm) in El-Ibrahemia district, Sharkia Governorate were studied, during two successive years (2004/2005 and 2005/2006). The total number of R. rattus (Linn.) were (435 and 329 individuals), (84 and 67 individuals) and (86 and 66 individuals) recorded in houses, granaries and poultry farm during the 1st and 2nd years, respectively. The data indicated that females outnumbered males all over the year in the three studied locations except during the 2nd year, in the granaries. The number of mature stages exceeded that of the immature ones at the different locations during all the studied years. On the other hand, the poultry farm obtained the highest average number of embryos per pregnant female for the roof rat was 7.1 and 7.3 during the 1st and 2nd years, respectively.