There is a growing concern about the fertility preservation (FP) for cancer patients of childbearing age. This study is the first in China to survey men with cancer, of reproductive age, regarding their knowledge of FP and their related needs. A 12-item cross-sectional survey was conducted of 332 male patients. The score for knowledge of FP was 3.5 +/- 0.67, of a possible score of 8. Only 10.6% of the subjects had chosen to preserve fertility before treatments, but during therapy 68.7% wanted more information about FP. Younger patients were more likely have more knowledge concerning FP than older patients (odds ratio [OR] 0.86). The decision to make arrangements for FP before treatments was heavily influenced by being young and without children (OR, 0.78; OR, 0.11). Male cancer patients of reproductive age had limited knowledge of FP, and the majority was disinclined to make FP arrangements before therapy in China. Therefore, male cancer survivors should be well informed about FP soon after diagnosis and programs should be considered to improve the FP-related knowledge of male cancer survivors. We suggest that an assessment of patients' understanding of FP issues, before treatment, should be standard in clinical work.