Usual water has many unusual properties, the reason of which is its cluster structure. In our work, we investigate structure and spectral properties of different water clusters by means of vibrational spectroscopy and quantum-chemical simulation. In Chapter 1, structure peculiarities of water in liquid and solid states are studied. Chapter 2 is devoted to investigation of water clusters in matrix isolation.In Chapter 3, an effect of argon environment on water clusters trapped in low-temperature matrices is discussed.