In this paper , we study the large scale structure formation of the normal branch in DGP model ( Dvail , Gabadadze and Porrati brane world model ) by applying the scaling method developed by Sawicki , Song and Hu for solving the coupled perturbed equations of motion of on-brane and off-brane .
There is detectable departure of perturbed gravitational potential from LCDM even at the minimal deviation of the effective equation of state w _ { eff } below -1 .
The modified perturbed gravitational potential weakens the integrated Sachs-Wolfe effect which is strengthened in the self-accelerating branch DGP model .
Additionally , we discuss the validity of the scaling solution in the de Sitter limit at late times .