The demographictrendsthat dominatedin the Syriansocietyin the last century, As the declineinmortality rates, And the rapid rise of life expectancy at birth, And subsequent decline in the birth rate high Which in turn reduced the rate of population growth, which contributed to the change ratios lengthy age groups(children and young people and the elderly),This change contributed to increase the number of arrivals to the labor market. This search monitors the role of demographic transition in changes in the Age Structural Transition Syrian society And determine the phase experienced by the beginning of the third millennium, Relying on data on birth and death rates and the percentage of the population within the age groups lengthy in Syria so dependent to the results of the general census of the population. the most important results: -theAgeStructural Transition in Syria Started since the mid-twentieth century. -The growth rate rose class working-age population[64-15]year from (49%) of the total population (1960)to (52.2%) in the year (1994), to reach (57.2%) (2004). - Syria entered, the beginning of the new millennium, at the end of the second phaseAnd the beginning of the third stage of Shift the and characterized by the expansion of the number of people in middle age.