The natural increase of Slovak population has passed through several variable waves since 1950. The most favourable trend was from 1950 till 1966, in a range of 17. 34— 10.22 per 1,000 inhabitants. After 1980, this rise rapidly fell down, from 8.93 to 0.31 in 1999. Some irregularity between an increase and reduction in productive-age population has appeared. A higher increase in the post-productive-age population will be in 2010, but it will not be compensated by an afflux of young people at productive age. Although slightly, the old age index is increasing. However, the coefficients of dependence of young people, which express the future reproduction of working population are falling. The adverse situation in reproduction is starting to affect human resources management.