In order to find a way of fast confirmation for the real time clearance of online financial trading, this paper analyzes the typical online trading process and the security characteristics. Based on the principle of elliptic curves signing, a kind of clear confirmation scheme is proposed, which can confirm the trading result step by step, and finish it once a time at the final clear. This scheme can avoid the complicated PKI system and the one by one confirm process, realize the non-reputation efficiently, keep the proof of signing easily, and make straight through process and online clear and possible.