Objective To explore the correlation between anxiety and social support in patients before radio frequency catheter ablation (RFCA). Methods A cross-sectional study was conducted on 120 patients before RFCA from September to November 2014. The participants were asked to complete the Self-rating Anxiety Scale and Social Support Scale. Anxiety score and social support score were compared with the Chinese norm throught-test, and Pearson Correlation was used to identify the correlation between anxiety and social support. Results The mean score of RFCA patients’ anxiety was 46.33±9.67, significantly different from the Chinese norm (t=18.700,P<0.05). The total score of social support was 39.80±7.59, significantly higher than the Chinese normal (t=7.287,P<0.05). Anxiety had negative correlation with social support, and the correlation coefficient was –0.377. Conclusions Patients’ anxiety before RFCA is higher than normal people, and social support is one of the significant factors of anxiety. Consequently, enhancing social support is a great contribution to relieve anxiety.