As a result of the fact that at the end of 2011, in Romania, was conducted the Population and Houses Census, many studies were focused on the demographic evolution from our country. Our paper is focused on the factors that are influencing the evolution of population in Romania, in order to explain the evolution of demographics. The study was conducted on a 20 years timespan, using statistical data that are characterizing the macroeconomic and demographic environment between 1990 and 2010.

To achieve our goals, we will use the statistical methods to analyze the data released (time series and cross section data) by the National Institute of Statistics. We will try to find some correlations between the evolution of population and social (natural increase of population, net migration) and economic factors (employment, average net wage, GDP).

We conclude sustaining that the increase of emigrants and the ageing phenomenon in last 20 years decreased the number of population, while the increase of employment and GDP are two factors that have a positive influence on the population evolution. The average net wage may have two types of effects: an increase of the wage may represent an opportunity for some families to cover easily the cost of having a child, while for others, the opportunity of gaining higher wages may change their working behavior determining them to focus on career and postponing the birth of a child.