From the "connotation" and "nature", modern trade contract and salt trade contract came down in one continuous line.

Experts in the legal academic circle and the judicial circle hold a traditional view that whether the transfer of property right has been registered is taken as prerequisite for the deal contract to become valid.

At thing judgment rule that fruits belong to that deal contract make, the educational circles of our country has different understanding.

Talking about the Responsibility for Breaking up a Sales Contract on Installment Buying;

With reference to sales contract, charter party and the relative clauses of b/l, this paper gives an exposition of the causes of demurrage disputes under voyage charter parties, the responsible party of demurrage, and the incorporated clauses of b/l, whereby to shed light upon the complicatedness and variousness of the disputes on demurrage.

Defect warranty originated in Roman law,later has been adopted by modern civil law countries and then developed into a special mechanism in sales contract of various civil codes,while in common law countries it has been affirmed through case law.

In China the consignation is the common principle in the business contract , but there are some other special rules.

The system of risk responsibility of the business contract has important position in the contract law.

Forward house-selling contract is a kind of buying and selling contract in special form.