Impact of Different Language Teaching on Baseball Throwing and Catching: English vs. Chinese Purpose: Second Language Teaching (SLT) is believed to better improve students' academic performances, language acquisition and academic success (Grabe & Stoller, 1997; Snow & Brinton, 1997; Stryker & Leaver, 1997; Al-Mously N et al., 2013; Kaliyadan F et al., 2015; Sadeghi B et al., 2013). It is not yet known if SLT can help student to improve their performance in sports. This study focused on the influence of English immersion teaching method (EITM) and Chinese native language teaching (CNLT) on baseball throwing and catching (BTC) of college students. Methods: A total of 49 college students, who were all beginners, were randomly assigned to the experimental group (EITM) (n = 26, male% = 26; age: 18.85 ± 0.68 yr.; height: 175.67 ± 6.64 cm; weight: 69.55 ± 10.74 kg), and the control group (CNLT) (n = 23, male% = 23; age: 18.17 ± 0.39 yr.; height: 166.43 ± 6.87 cm; weight: 68.01 ± 10.96 kg). There was no significant difference in BTC measured by baseball skills assessment between two groups (EITM1: 1.62 ± 0.90, CNLT1: 1.43 ± 1.04, P > 0.05, ES = 0.18) before the intervention. Both CNLT and EITM interventions were 90 minutes per week, for a total of 16 weeks. Except for language, the teaching hours, contents, plan and evaluation were all the same. Paired t-test, independent sample t-test and normality test were used and effect size (ES) was computed based on: (μ1-μ2)/α(μ = Mean, α = SD). Results: Compared with pre-intervention, BTC of both EITM2 and CNLT2(16.46 ± 2.23, p < 0.01;14.52 ± 3.00, p < 0.01, respectively)was improved, but ES in EITM(16.53) was larger than CNLT (12.62). In addition, there was a difference between EITM2 and CNLT2 with an ES = 0.65. Together, the benefit of SLT to sport learning was supported. Conclusion: Compared with CNLT, EITM showed some benefits on the improvement of BTC of college students.