Background: Because there are acute occurrence and severe clinical findings in large area cerebral infarction, early diagnosis is very significant to early treatment and nerve function recovery. Objective: To discuss the effects of early diagnosis of large area cerebral infarction on nerve function recovery. Unit: Department of Urology, Second Hospital of Changtu County in Liaoning Province. Subjective: The cases in the research came from 132 patients with cerebral infarction identified by CT examination during 1995～ 2000, including 59 males and 73 females. The ages ranged from 37 to 72 years old, and mean age was 59. There were 78 patients who were troubles with hypertension past, 41 diabetes and 62 coronary heart diseases with atrial fibrillation. 132 patients entered the hospital in the episode day, and other 4 patients did 24 hours after the episode day. In the patients, there were 132 appeared with complete hemiplegia, 87 with different level conscious disturbance ( 60 somnolence and lethargy, 27 coma ), 76 accompanied with anepia, 93 with headache and vomiting, 36 with tic, 33 with ocular disturbance, 64 identified as papilledema, and 26 appeared with cerebral symptoms, 37 occurred metula hemorrhage. Intervention: All the 132 patients accepted cerebral CT examination within 24 hours since the onset of illness, and decreasing intracranial pressure,thrombolysis,protecting brain cells,anti-inflammation treatments. Result: There were large area low-density focuses in the blood-supplied region of middle cerebral artery and intal jugular vein in 19 patients CT films 10 hours after onset of illness, and in addition 8 cases were transferred to surgery department for cerebral hia. 37 patients with cerebral hemorrhage after infarction accepted neutrality therapy, and the symptoms relieved obviously for 29 days in the hospital. 69 patients restored conscious disturbance and muscular force of the troubled limbs notably, 29 cases left the hospital automatically, and 34 case were died ( 13 died of brain hia, 21 died of infection and other diseases ). There were not examined focuses in post-cerebral CT, and large area infarction appeared in CT films 24 later. Conclusion: It is capital for decrease of fatality rate and mutilation rate and nerve function restoration to perform early diagnosis and apply early treatment of large area cerebral infarction.