| With the international finance crisis influence on real economy being larger and larger in china, Logistics industry which is an important service industry is impacted severely too. At the same time, the reality of small scale and single service function of numerous logistics enterprises has greatly restricted the development of China's modern logistics industry. The integration of the resources of logistics enterprises from the angle of supply chain management that can enhance the service quality should be the important countermeasure that will accelerate the development of logistics industry. And the fourth party logistics (4PL) is a good form of the integration of the logistics resources. Because the achievement of the aim of the 4PL system needs dynamic cooperation of node enterprises of supply chain and logistics enterprises and 4PL enterprise, it is necessary and feasible to research the question of 4PL operation based on the theory of CAS. And it's both theoretically and practically meaningful to study the key mechanisms and optimization method of the questions of logistics partner selection, the logistics order allocation and the dynamic harmony that can improve the result of the logistics resources integration.In this paper, the questions of five aspects are studied on the basis of the expatiation of the theories of CAS, SCM and GA.Firstly, the Conception of 4PL System and the three kinds of elements are put forward, and by contrasting the fact of 4PL system with the seven characters that every CAS should have, the 4PL system is ascertained as a kind of CAS. Meanwhile, three individualities of 4PL system are brought forward.Secondly, three kinds of Agents including 4PLAgent, LAgent and SCCAgent are supposed, and the dissertation analyzes the sub-agent of each Agent, puts forward the dynamic operation model of 4PL system and the three core mechanisms:the mechanism of logistics partner selection, the mechanism of logistics order allocation and the dynamic harmony mechanism based on logistics order allocation.Thirdly, the dissertation proposes logistics partner selection index system and uses the method of AHP to determine weight coefficient of each index, on the basis of analysis of the content of "Logistics Enterprises Classification Assessment Standard" and the influence factors of logistics partner selection. Whereas the 4PL enterprise usually selects more than one logistics enterprise of more than one kind as its partners, the dissertation proposes an optimization model of the logistics partner selection under the 4PL model, based on comparing strength of each logistics enterprise and compartmentalizing the logistics demand by region. And an improved algorithm is presented based on genetic algorithm by using the methods of binary encoding, larger initial population size, smaller crossover probability and larger variation probability.Fourthly, four rules and an optimization model of multi-aims of logistics order allocation are brought through analyzing the influence factors of logistics order allocation. Different aim, different result, the dissertation puts forward two kinds of order allocation mechanisms named mechanism based on SCCAgent and mechanism based on 4PLAgent. And an optimization model for logistic order allocation and the improved algorithm are presented based on GA by using the methods of natural number coding, punished-function, larger initial population size, smaller crossover probability and larger variation probability.At last, the dissertation constitutes three dynamic models based on the above two kinds of order allocation mechanisms, and is used the software of MATLAB7.0 to simulate the dynamic process. The convincing simulation result is achieved through modulating the basic data and parameters during the dynamic process of emulation. The result shows that order allocation mechanism based on 4PLAgent is better than the mechanism based on SCCAgent and we should choose mechanism based on 4PLAgent to allocate the logistics order.
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