The electrostatic driven complex formation between a weak polyampholyte chain and one positively charged nanoparticle is investigated using Monte Carlo simulations. The influence of parameters such as the polyampholyte contour-length, number and size of blocks, nanoparticle surface charge density, and solutio properties such. as the pH and ionic concentration, on the PA titration cues is investigated. It is shown that the presence to the act positively charged nanoparticle significantly modifies acid/base properties of the weak polyaropholyte by, on the one hand, promoting the formation of negatively charged monomers and on the other hand, limiting the number of positively charged monomers. The electrostatic interactions of this system can be modified by pH, ionic concentration, and nanoparticle surface charge The competition between attractive and repulsive, intramolecular and intermolecular electrostatic interactions I e. a to a wide range of possible PA conformations at die nanoparticle surface, which have a direct impact on the nanoparticle stabilized or destabilized solutions. Extended conformations electrostatic rosettes, and dense multiplayer structures are observed. Nonetheless, the intramolecular interactions between the positively and negatively charged PA monomers, in particular at the isoelectric point, are found to play, important and subtle roses :for both the isolated and adsorbed chain conformations. It is also found that nanoparticle charge inversion is an important ingredient for the formation of multilayer structures at the nanoparticle surface.