Abstract: This paper presented a dynamic multi issue negotiation model (DMNM)，the model is composed of two parts:the environment model (PCCM) and decision-making model (NDM). PCCM uses the population growth theory of the ecology, combines with changes in population density to effectively analyse the competition and collaborative envi- ronment. I3y introducing the characteristics of individual decision-making, NDM improves flexibility, and applies a hy- brid optimisation algorithm (CE-HOA) based on co-evolution to achieve concessions balance on the multiple issues, to ensure that the interests of decision makers. Experiment the results show that the negotiation model (DMNM) not only can effectively balance the selection of short-term interests and long-term interests, but ensure makers to obtain maxi- mum benefits. In additional,CE-HOA algorithm improves the efficiency of search under the premise of ensuring the re- sult cauality,so that decision-making process is more efficient

Key words: Negotiation, Competition, Cooperation, Ecology, Cocvolution, Particle swarm optimization