The experiment did not carry out the dynamic observation of GH level at different time poin, so the GH curve is still not clear, larger sample size and dynamic observation of GH level is needed; Because rhGH administration and dosage may have an impact on cognitive function, so the next experiment should thoroughly investigate the cognitive impairment in rats after TBI and the role of rhGH administration and dosage. Here, GH1 is linked to Cognitive impairment.