Study aim: Determining the Effect of Multimedia Education on Uncertainty in Women with Breast Cancer. Design: A randomized clinical trial was a single-blind clinical trial. A total of 60 patients were selected. Simple and objective sampling was done based on entry and exit criteria. Settings and conduct: Before the uncertainty intervention, two groups of test and control are measured, then the educational DVD is provided to the test group. The uncertainty of both groups is determined 1 and 2 months after the end of the intervention. Participants/Inclusion and exclusion criteria: Inclusion criteria:Patient's willingness to participate in the study، Confirmation of breast cancer by an oncologist، Awareness of the patient from his illness (the disease has not been hidden from him)، Age 30 to 60 years old، At least six months have passed since they became infected and treated for cancer، Literacy to read and write in Persian، Access to the computer and the ability to use it at the beginner، level (Open CD and access information)، The lack of cognitive and mental problems، The absence of a history of chronic underlying disease such as multiple sclerosis, AIDS, heart and respiratory failure، The patient is not in the stage 4. Exit criteria:Unwillingness to continue cooperation in the study، Immigration of the patient، Patient death Intervention groups: Samples will be available in the DVD Intervention Team with educational content and training on how to use it and two weeks to view it. During this time, the researcher will remind the participants with SMS. The telephone number will be provided to them in order to be able to contact the researcher in the event of a problem or a question. In the control group, no intervention will be performed and only the uncertainty of the samples will be measured. Main outcome variables: Multi-media education is expected to reduce uncertainty in women with breast cancer.