The two-fold industrial structures of Xigu District, the old industrial base, has caused structural contradiction , which is the deep reason of influencing its sustaining and harmonious regional economical development.

Activity and Limitedness Based on Practice——Comments on Giddens Duality of Structure;

In the process of studying,I mainly make use of the method of qualitative analysis and adopt the theory of Anthony Giddens,namely,duality of structure in order that we can disclose the relationship between action and structure under the background of the entrance examination for senior middle school.

The understanding of the connotation of "history" needs to connect it with the concepts of "historicity" and "reflexivity" ,as well as "make" with the duality of structure.

The coding method was improved, in which the initialization, crossover and mutation are based on dual-structure coding, and the elitist strategy,adaptive partially matched crossover,and adaptive inversion mutation are adopted respectively in the proceses of selection,cross and mutation.

China s new rural building is facing the "double dual structure" constraints which is different from other countries and regions.