Playing handball entails numerous forms of stress, anxiety, and aggression that young female handball trainees need to be able to manage to bring the desired performance. It is also important that they release any accumulated tension in a way that would enable them to be more assertive. The objective of this study was to investigate the effects of psychological factors of stress, anxiety, and aggression on the game performance of young female handball trainees. To address this objective a correlational research design with a quantitative approach was used. The sample consisted of eighty under seventeen female handball trainees from four youth female handball projects. The trainees were selected by using purposive sampling. And the four projects were selected using compressive sampling to include all young female projects. The researcher used these standard questionnaires of aggression, Perceived Stress Scale for stress, sports competition anxiety test for anxiety, and game performance, real-time game observation checklist was used adopted by the researcher to collect data. And the statistical analyses were examined through SPSS version 27 software, the researcher used correlation, regression, independent t-test, and Two-way ANOVA. It is found that the stress, anxiety, and aggression of the trainees are moderate level. Where values p≤0.05 were considered as significant. The result indicated that anxiety, aggression, and stress had a negative correlation with the performance of young female’ handball trainees (r= -.883; p= 0.000, r= -.870; p= 0.000, r=-.782; p= 0.000 respectively). Anxiety is the predictor variables that donate the highest variation of Game performance. Based on the results, it was found that there is a strong correlation between anxiety and aggression. It implies that it is essential for young female handball trainees to acquire coping mechanisms to manage stress, anxiety, and aggression efficiently enabling them to enhance their performance. ‘ Key words: Game analysis; Game performance; Performance indicators; Real-time game