Theoretically, the application of transcutaneous electrical acupoint stimulation (TEAS) base on the traditional Chinese medicine. It deems that a surgery might consume Qi and Blood, then cause to unbalance of them, especially in elder patients. Once it happen, many postoperative complications show up such as postoperative nausea and vomiting, postoperative deep venous thrombosis, et al. The traditional Chinese medicine considers that TEAS can enhance Qi support, restore the balance of Qi and Blood through manoeuvring primary vigor, consequently, to avoid the postoperative complications.