الفهرس 
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Abstract
In this thesis we study asymptotic behavior of the solutions of some difference equations. This thesis consists of introduction and four chapters. In Chapter 1, we study the boundedness, periodicity and global stability to the solutions of big order difference equation. Also, we give a solution form of this equation and we consider two special cases of this equation. In Chapter 2, we study two nonlinear difference equation one of order two and the other of big order, in these equations we prove that the solutions are global stability, periodic and we give a solutions of some special cases of these equations. In Chapter 3, we investigate boundedness, the global stability and the periodicity character of the solutions of three rational difference equations of a different order. Finally, in Chapter 4, we discuss the periodic solutions of five system of difference equations, and give the form of solutions.