Virtual sample library is developed for accessing multi-dimensional data acquired from several measurements on a single combinatorial sample library. One can extract any data easily through this virtual library without remembering where each data is stored in the huge hard disk in his/her PC. This is because the library has an object-oriented structure, that is, the library stores not only experimental data but also the relations between the data and the positions in the actual sample library. An actual example is demonstrated for the case of one-dimensional combinatorial glass sample library. Some long glass libraries containing Er and F are annealed in a temperature-gradient furnace and the decay curves of 1.5m-fluorescence are recorded along the libraries in order to find annealing conditions for precipitation of Er-containing fluoride nanocrystals. Virtual libraries are constructed for plotting their fluorescence spectra, fluorescence lifetime, state of precipitates as a function of annealing conditions.