Abstract Simulation model validation was one of the important contents in modeling and simulation technology. Traditional grey relational analysis method just considered data curves’ geometrical shape. Aiming at the limitation of traditional grey relational analysis, this paper proposed the improved grey relational analysis based on weighted linear. It took into account of data curves’ geometrical shape, similar degree of data value and decision-makers’ preference together. Therefore, it made the result more credible. The rationality and effectiveness of improved grey relational analysis were verified with example.