The wild biotic resources are renewable and can be made to meet the human needs permanently by rationally utilizing and managing them, otherwise they would be destroyed and never be recovered. This is an important problem in applied ecology. Some principles and measures in using and managing the resources were known by the ancient Chinese before Qin-dynasty, i. e. 2200 years ago. This paper deals with some recognitions of this question, as found below:1. The old records reflect the processes from destroying...