Paper was based on archival research and props upon relevant literature, all Serbian, Albanian, and written in foreign languages, depicting Albanian ethnic population development in Kosovo within 20th century. We consider it to be the most crucial for any and all political processes, taking place in said region during 20th century. It reflects also demographic evolution of other Kosovo ethnics/nationalities, showing them in mutual interactions. In its second part Paper herein analysis both causes and consequences of Albanian demographic revolution., Václav Štěpánek., and Obsahuje seznam literatury