Group decision-making plays a crucial role in organizational management, yet there is limited research focused on systematically identifying and quantifying its key dimensions. This research aims to explore the essential factors of performance dimensions in group decision-making and develop a scale to measure these components. A comprehensive literature review identifies critical factors influencing group decision-making, including individual factors, group dynamics, and decision-making performance. Based on the 187 valid questionnaire responses collected, a structural equation model is designed for empirical analysis. Using AMOS 24.0 software, confirmatory factor analysis is conducted to assess the validity and reliability of the measurement scale. The analysis suggests that individual factors impact group dynamics, while group decision-making performance is influenced by both individual and group factors. Path analysis reveals significant relationships among the performance dimensions, offering theoretical insights into effective group decision-making management. The research concludes with practical recommendations to help organizations enhance the efficiency and quality of their decision-making processes.