The mass of the Schwarzschild black hole, an observable quantity, is defined as a dynamical variable, while the corresponding conjugate is considered as a generalized momentum. Then a two-dimensional phase space is composed of the two variables. In the two-dimensional phase space, a harmonic oscillator model of the Schwarzschild black hole is obtained by a canonical transformation. By this model, the mass spectrum of the Schwarzschild black hole is firstly obtained. Further the horizon area operator, quantum area spectrum and entropy are obtained in the Fock representation. Lastly, the wave function of the horizon area is derived also. black hole, Fock representation, mass spectrum, quantum area spectrum, wave function of horizon area After Bekenstein's [1] and Hawking's [2] initial work, the thermodynamics and the statistic mechanics of black holes have been one of the important research areas. Especially in recent years, many authors have already obtained some interesting results on the thermal radiation and the entropy of black holes [3][4][5][6][7][8][9][10][11] . Many conclusions with various different methods revealed that the black hole's entropy is proportional to the horizon area. According to this idea, it is significant to establish an accurate quantum model of black holes, realize space-time quantization, and study quantum spectrums of the black hole horizon area. These topics are active research fields at present. Bekenstein (1974) firstly argued that the possible eigen values of the black hole's horizon area were [9] 2 pl ,where n is an integer, γ is a pure number of one order and 3 pl l Gc − = is the Planck's length.In order to approve the Bekenstein's hypothesis, many authors established different quantum models of black holes [12][13][14] , and the quantum area spectrums were obtained. Louko and Mäkelä [13] derived the quantum area spectrum of the Schwarzschild black hole's horizon: