Educational equity contains three rational principles of educational resources allocation,namely equality principle,difference principle and compensation principle.

After analyzing the research progress in terms of the fundamental theory and compensation principle,the authors determines the basic elements of ecological regulation compensation,for a study case of Yinma River basin,which include compensation body,compensation objects,compensation standards and guarantee measures.

Based on the social insurance tax which is exerted in China for the purpose of improving the system of social insurance, this paper discusses the theories and authors of social insurance in a systematically way, analyses the principle of compensation and judging criterion and points out the advantages and disadvantages of social insurance in economic market construction and development of economy.

Through its advocacy by the principles of freedom and equality,the principle of equal opportunities,the ability difference principle,the principle of compensation for the disadvantaged,the principle of giving priority to the efficiency of the five basic principles of discourse and interpretation.

Right of subrogation in insurance law is main content of subrogation rule derived from principle of indemnity,it is legal and accessorial creditor s right owned by insurer against the third party who takes the responsibility to insurance accident,but not insurant.