5. clear rapid development period of infants receive propofol and etomidate on plasma according to beta protein after intravenous anesthesia and Glu, GABA expression and its relationship between the change of cognitive function and clarify all according to propofol and etomidate intravenous anesthesia on the brain is in rapid development period of infant short-term and long-term postoperative cognitive function and its possible mechanism, the influence of safety for children suffering from anesthesia, and to provide theoretical basis for the rational use of drugs.