A meta-analysis of the intervention effect of mindfulness training on athletes' performance was conducted, including 11 studies with a total sample size of 582. The results showed that mindfulness training significantly improved athletes' mindfulness level [SMD=1.08, 95%CI(0.30,1.86), p<0.01], fluency [SMD=1.47, 95%CI(0.87,2.08), p<0.001], and performance [SMD=0.92, 95%CI(0.40,1.43), p<0.01], while reducing psychological anxiety [SMD=-0.87, 95%CI(-1.54,-0.20), p<0.05]. All effects reached the level of large effect size. The study concluded that mindfulness training is effective in improving athletes' sports performance and can be used as an effective psychological intervention method. Future research should expand the sample size, strengthen comparative studies of different sports and intervention modes, and pay attention to the difference between the time effect and trait mindfulness level in fluency state. The study used PRISMA guidelines for literature screening and included randomized controlled trials with specific inclusion and exclusion criteria. Data analysis used R software, with effect sizes calculated using standardized mean difference (SMD). Publication bias and sensitivity analysis were conducted, and the results showed no significant publication bias. The meta-analysis confirmed that mindfulness training significantly improves athletes' mindfulness level, fluency, and performance, and reduces psychological anxiety. The study also identified limitations, including the exclusion of unpublished studies and the heterogeneity of the included studies. Future research should focus on expanding the sample size, strengthening empirical research on fluency, and exploring the application of new technologies like VR in mindfulness training.A meta-analysis of the intervention effect of mindfulness training on athletes' performance was conducted, including 11 studies with a total sample size of 582. The results showed that mindfulness training significantly improved athletes' mindfulness level [SMD=1.08, 95%CI(0.30,1.86), p<0.01], fluency [SMD=1.47, 95%CI(0.87,2.08), p<0.001], and performance [SMD=0.92, 95%CI(0.40,1.43), p<0.01], while reducing psychological anxiety [SMD=-0.87, 95%CI(-1.54,-0.20), p<0.05]. All effects reached the level of large effect size. The study concluded that mindfulness training is effective in improving athletes' sports performance and can be used as an effective psychological intervention method. Future research should expand the sample size, strengthen comparative studies of different sports and intervention modes, and pay attention to the difference between the time effect and trait mindfulness level in fluency state. The study used PRISMA guidelines for literature screening and included randomized controlled trials with specific inclusion and exclusion criteria. Data analysis used R software, with effect sizes calculated using standardized mean difference (SMD). Publication bias and sensitivity analysis were conducted, and the results showed no significant publication bias. The meta-analysis confirmed that mindfulness training significantly improves athletes' mindfulness level, fluency, and performance, and reduces psychological anxiety. The study also identified limitations, including the exclusion of unpublished studies and the heterogeneity of the included studies. Future research should focus on expanding the sample size, strengthening empirical research on fluency, and exploring the application of new technologies like VR in mindfulness training.