The fact that the envelope of prostate cancer is intact and continuous does not mean that the cancer cells have not metastasized. Whether prostate cancer has metastasized or not needs to be combined with CT, MRI, whole-body bone imaging and other imaging examinations to further judge, and it is impossible to judge the metastasis of the tumor only by observing the tumor locally. The continuous and intact peripheral membrane of prostate cancer only suggests that the growth of the cancer is relatively limited, and the possibility of invasion to the surrounding tissues and distant metastasis is small, but it is not completely impossible. Prostate cancer has various ways of metastasis, not only local infiltration and invasion, but also lymphatic tract metastasis and blood tract metastasis. If prostate cancer is detected by examination, it is necessary to follow the doctor’s advice and take appropriate treatment in time without delay so as not to miss the time of treatment.