It is recently reported that arthroscopic operation can bring about a satisfactory result in meniscus lesion of the knee joint, but this operation is not widely done. Our recent experiences of this procedure is presented. Twenty-seven knee joints were operated through this procedure in twenty-three patients with meniscus lesion. Medial meniscus was removed in thirteen cases, lateral meniscus in seven, lateral and medial meniscus simultaneously in three and lateral meniscus on both sides in one. Five patients showed discoid meniscus. The average time of operation was about a half hour in partial meniscotomy and seventy minutes in total meniscotomy. The patients were discharged from the hospital on the 10th postoperative day in average. Postoperative results were satisfactory in most of the patients. The conventional surgical procedure can be replaced by the arthroscopic surgery in meniscus lesion.