The paper summarizes building electronic ethnological databases in the Institute of Ethnology of the SAS since the end of 1980s till the present time. The author considers the period from the first half of 1990s to be oriented on testing the ways of utilizing PCs in building of the databases of the ethnological data. During this period the workers of the Institute started to use the electronic databases to build electronic catalogues belonging to the archive funds of the Institute of Ethnology, to create the bibliography of Slovak ethnology and funds of electronic documents. The contribution characterizes single projects which had been realized in the Institute in the framework of the mentioned problems. In conclusion the author introduces the principles of the building electronic database of the ethnological information based on the experiences of the Institute of Ethnology.