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.

From three aspects, the legal formation of de facto marriage protection, the important condition of the establishment of de facto marriage and the legal effects of de facto marriage, the system of de facto marriage in Japan is similar with China in some aspects, but there are great differences.

Clarifying the judging criteria for establishing the legal circumstances for demurrer of anticipatory breach and making sure about the cause for and time for performance and the legal effects for the exercise of demurrer of anticipatory breach are significant in the rightfully implementing the institution .

The sale of not breaking the legal effect of lease;

On legal effect of insurer s breach of the duty of presentation;

On Carrying-out Condition of Tax Subrogation and Legal Effect;

The law effect onthe expiration of time-effect forfeiture affects directly whether the civil body can perform his own civil rights.

The term of the unification of law effect and society effect has been popular in recent years.