2. the children's intelligence equation of the People's Republic of China neuropsychological test: P, E group of preoperative 1 day before operation, postoperative day 3, 3 months neuropsychological test, observe and evaluate patients POCD is happening; Correspond to the experimental group in the same period in group C, i.e., the first test (1 d) preoperatively, 4 days after the second test (3 d) after operation, 3 months after the third test (3 months), observed and compared with experimental neuropsychological testing of variation;