Meniscal cysts develop mainly in young people, and the common types are intra- and peri-meniscal cysts. The main symptom of meniscal cysts is joint pain, which is aggravated by activity. Most patients can see obvious masses in the knee joint space, which can gradually grow, with painful pressure on the masses and gradual atrophy of the thigh muscles, and some patients have joint popping and locking. The diagnosis can be confirmed by MRI of the knee joint. The meniscus is a fibrocartilage located in the knee joint space between the femoral condyle and the tibial plateau, with a thicker outer edge and thinner inner edge. When the meniscus is injured or degenerated, meniscal cysts are likely to form, and most of them will grow gradually. Meniscal cysts should be actively treated with arthroscopic surgery. Minimally invasive arthroscopy is a 5-mm diameter rod-shaped optical instrument that is used to view the internal structures of the joint. The internal structures of the joint are displayed on the monitor, allowing dynamic observation of the extent to which abnormal tissue affects joint stability and function. Under the supervision of the monitor, various lesions are accurately removed, trimmed, sutured, fixed, and reconstructed for the purpose of radical treatment. The treatment of meniscal cysts is highly effective.