Aging sensitive commodities are those who must be sold within a certain period of time or their value will have a decline, in other words, the value is changing over time. In order to maximize the profit of the aging sensitive commodity product operators, both the sellers and buyers should arrive dynamically and leave the market within their time limits, the traditional auction mechanism design method in static environment is not suitable for solving the problem in dynamic environment. This paper presents an online double auction mechanism DAPA (Double Auction Payment Allocation) for aging sensitive commodity under dynamic environment, and then proposes and implements the corresponding allocation and payment algorithm as well. We carry on a theoretical analysis on truthful and establish the simulation experiment to prove that our DAPA is superior in improving transaction success rate and realizing fair price-making between traders than traditional equilibrium matching in static environment.