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The recently relased \emph{Planck} data, emphasize that the backgroundgeometry of inflation is not pure de Sitter, but from the slow variation ofHubble parameter during the inflationary era, it can be quasi-de Sitter. Thismotivates us to consider an asymptotic de Sitter mode function forreconstruction of initial mode and primordial power spectrum of curvatureperturbation. Using Markov Chain Monte Carlo (MCMC) method together withapplying recent observational constraints from the Cosmic Microwave Background(CMB) data for our parametrized asymptotic initial mode shows some deviationfrom pure de Sitter or Bunch-Davies mode. Based on \emph{Planck 2015} datarelease the amplitude of scalar perturbations in $ 68 \%$ confidence level is$10^{9} A_s =2.77^{+0.32}_{-0.35}$ and deviation from Bunch-Davies mode is$\sim 0.03-0.04$. In this parametrization, the CMB power spectrum of our modelshows more red-tilt in comparison with $\Lambda \rm{CDM}$ model. Furthermore,we found upper limit for tensor-to-scalar ratio with different pivot scales$r_{0.05}< 0.0272$ and $ r_{0.002}< 0.0242$.

Reconstruction of initial Asymptotic-de Sitter mode in light of the Planck data