The 18th Constitutional Amendment Act of 2010 completely changed Pakistan`s federal system when considerable laws and legislative, executive, and authority for budget management were granted and handed over to provinces. This research investigates the effectiveness of provincial laws in the Khyber Pakhtunkhwa Assembly through the 18th Amendment. This research also shows the improvement in governance and legislative autonomy and KP's capabilities for managing this devolution of powers. The important laws and legislative measures are highlighted in this research which were carried out after the 18th amendment, with mainly and particular significance on the health care, education system, and local government as well. However, the KP Assembly has significantly exercised its authority and enhanced its legislative power to effectively address regional needs. Despite ongoing challenges and difficulties with interprovincial collaboration, they have managed to achieve this progress.