Generally speaking, optimism is not a determinant of survival rate and prognosis for cancer patients, but it is favorable for disease recovery, etc. Cancer is a common malignant disease, which is caused by a combination of internal and external factors, such as heredity and environment. The main treatment for the disease after diagnosis is surgical resection, which may be followed by radiotherapy depending on the condition. After treatment, in order to improve the prognosis, minimize recurrence and prolong the survival period, on the one hand, patients need to pay attention to follow the doctor’s instructions for regular review. On the other hand, patients should maintain a positive and optimistic attitude in their daily life. Studies have shown that hope and optimism, as positive psychological resources, can help people find positive meanings in problems, reduce negative emotions, and thus produce the release of relevant factors conducive to physical and mental health, which can strengthen the immunity and promote the recovery of the disease.