With the development of the modern village medical treament system and the western medicine substitution compulsively in curative function,Hmong's local medical knowledge is in facing of double puzzledom its in heritance and protection protecti.

This paper,taking the ecological salvation of stone desert in the limestone mountainous areas as an example,discusses the value of local knowledge in maintaining a weak ecological system.

The rice-fish agricultural system of Longxian Village in Qingtian County,Zhejiang Province,as a kind of unique local knowledge assimilated with local society,has long existed.

The paper puts forward the idea to study cross-cultural communication from the prospective of the local knowledge,and explains the function,methodology of the prospective.

Method: Systematizing relevant literatures and documents, separating the ineffective (unauthenticated)part from the knowledge of TCM and rejecting the dross remnants, standardizing further the language of TCM, etc.

Taking goldthread plantation by the Tujia ethnic group as an example, the paper discusses about the inheritance and protection of local ecological knowledge of Chinese ethnic groups, in the hope of developing and using forefathers ecological wisdom to meet the ecological challenges confronted by human beings nowadays.