Lightweight block cipher algorithms are essential to their throughput and high level of security, there are many applications that need this type of encryption, such as RFID, Credit Card, transfer data securely and integrity, etc. The PRESENT-128 is one of these algorithms based on the Substitution-Permutation Network (SPN) and Key Schedule Algorithm (KSA). In this research, in an attempt to increase key security and minimize key size, we propose an Optimized Key Schedule Algorithm based on Elliptic Curve Cryptosystem. The method analyzes and enhances the current key schedule to enhance the confusion test and key security. While ensuring high safety, it significantly reduces key size.