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The article provides the results of studying magnetic and magnetostrictive properties of alloys in multi component systems (Tb1-хYх)0.8Sm0.2Fe2 with the substitution parameter х = 0, 0.2, 0.4, 0.6, 0.8, 1. Magnetization and magnetostriction studies are given in a wide temperature range. Compensation points on magnetization curves have been determined both along concentration and temperature curves. There is a magnetostriction constant sign inversion in the area of values 0. 8 ≤ х ≤ 0.9.