Aimming at the problems that correlations are widespread during the simulation system credibility evaluation process, which makes the aggregation operators under independent assumption failure and in the simulation credibility subject evaluation process, the expert judgment subjectivity is strong and its language performance ability is insufficient. Therefore, the group general intuitionistic fuzzy soft set correlated weight aggregation(G-GIFSSCWA) operator is defined. Then an aggregation method for the simulation system credibility indicators based on the G-GIFSS with correlations is developed, and a practical example about the China type CRH2 high-speed train fault injection simulation system is given to illustrate the flexibility and effectiveness of the proposed method.