Attorney answers questions: In the law of contract has not forbidden the agent not to act the round turns stipulation, but in fact the round turns have the conflicts of interest, the agent will act the round turns possibly to violate another side the benefit, some professions will forbid the agent terribly to conflict both sides. Some Tendering agency's is not among introduced between round turns function, but is both sides acts. That is, the Tendering agency in the house business legal relationship, namely the proxy buyer, acts the seller.