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Self-diffusion coefficients of Te and Se in pure Te or in SeX-Te1-x (x = 0,01) alloy, have been measured by using the capillary-reservoir technique. The results are presented by an Arrhenius law, D = 1,02.106 exp/ (-35.500/RT) for DTeTe* and D = 0,41 exp (-9.200/RT) for DDexSe*-Te 1-x(x = 0,01).Results are analysed and compared to solid Telurium self-diffusion data, Einstein - Stokes- Eyring equation and March-Brown's approximation.