Objective To study the effective anticoagulant components of the fermented products of mycelium from Tremella aurantialba 9800. Method To adopt system menstruum deal with fermented products of mycelium from Tremella aurantialba,then mycelium from tremella aurantialba was studied with the clotting time of the thrombogen,the whole blood clotting time in mice and thrombosis experiment in mice. Result Butanol extract of fermented products of mycelium from Tremella aurantialba behave anticoagulant function. Ethyl acetate extract and water extract also behave feeble activity. Conclusion The effective anticoagulant components of the fermented products of mycelium from Tremella aurantialb is butanol extract.