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BACKGROUND: Therapeutic hypothermia may need prolonged duration for the patients with severe traumatic brain injury (sTBI). METHODS: The Long-Term Hypothermia trial was a prospective, multicenter, randomized, controlled clinical trial to examine the safety and efficacy in adults with sTBI. Eligible patients were 18–65, Glasgow Coma Scale score at 4 to 8, and initial intracranial pressure (ICP) ≥ 25 mm Hg, randomly assigned to the long-term mild hypothermia group (34–35 °C for 5 days) or normothermia group at 37 °C. The primary outcome was the Glasgow outcome scale (GOS) at 6 months. Secondary outcomes included ICP control, complications and laboratory findings, the length of ICU and hospital stay, and GOS at 6 months in patients with initial ICP ≥ 30 mm Hg. This trial is registered with ClinicalTrials.gov, NCT01886222. FINDINGS: 302 patients were enrolled from June 25, 2013, to December 31, 2018, with 6 months follow-up in 14 hospitals, 156 in hypothermia group and 146 in normothermia group. There was no difference in favorable outcome (OR 1·55, 95%CI 0·91–2·64; P = 0·105) and in mortality (P = 0·111) between groups. In patients with an initial ICP ≥ 30 mm Hg, hypothermic treatment significantly increased favorable outcome over normothermia group (60·82%, 42·71%, respectively; OR 1·861, 95%CI 1·031–3·361; P = 0·039). Long-term mild hypothermia did not increase the incidences of complications. INTERPRETATION: Long-term mild hypothermia did not improve the neurological outcomes. However, it may be a potential option in sTBI patients with initial ICP ≥ 30 mm Hg. FUNDING: : Shanghai municipal government and Shanghai Jiao Tong University/School of Medicine.