الفهرس 
Review of Earlier WorkOnly 14 pages are availabe for public view
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Abstract
In the work presented in this thesis, we considered the autonomous perturbations of Van der pol’s equation (1.2). Adetailed study for a D - periodic soluation of (1.2) is carried out. The following two cases are investigated: (I) Exactly are characteristic multiplier of (1.3) is equal to + 1. (II) Both the characteristic multiplier of (1.3) are both equal to + 1. The existence, uniqueness and stability of the D - periodic solution of the perturbed Van der Pol’s equation are studied and proved. The implicit function technique was idely used in the proofs.