Based on the Thorndike trial-and-error learning and from the angle of learning table-tennis,the theories of the law of readiness,the law of effect and the law of exercise are further expounded.

This paper discusses the tactics in exploring morality by introducing the law of moral readiness,emotional constants and "environ influence" on the basis of "re-combing" the connotation,features and functions of moral needs in the "paradox" of present-day moral education.

The transference of creditor’s rights must accord with the legal standards of true sales, which involves recourse, right of remains, right to redeem collateral, price and control of account receivables.