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The Monte-Carlo method of description of the pre-equilibrium alpha-particle emission during the non-equilibrium stage of the nuclear reactions is discussed. The model was developed to describe the double differential spectra of secondary particles formed in the heavy ion reactions. Effect of alpha-clustering on the non-equilibrium stage of formation of the compound system is analysed. The de-excitation of the compound nucleus was also simulated by the Monte – Carlo method [1] taking into account fission and gamma-ray emission after equilibration. The neutron, proton and alpha-particle emission was considered for both equilibrium and the pre-equilibrium stages of the reaction. The results of the theoretical calculations are compared with the experimental double differential spectra of p and alpha-particles for the reactions with heavy ions [2]. Different clusterization probabilities have been considered. [1] O.V. Fotina et al.// Int. Journ. Mod. Phys. 2010. V.E19. P.1134. [2] V.L. Kravchuk et al.// Int. Journ. Mod. Phys. 2011. V.E20. P.1050.