Second: to continue to collect and analyze data. From the University, journals, books, and network to collect and filter paper-related information, and to sort out. Understand, are familiar with the research of others and found that others do not have the depth of field, their opinions.

Section 2: to continue to collect and analyze information. From the Related journals, periodicals, books and a network for further information, and papers related to filter out the information, and to organize them. Understand and are familiar with the research results to others and found that other

Second: Continues to collect and to analyze the material.From the correlation journal, the periodical, the books and the network carry on further collect, screen with the paper correlation material, and carries on the reorganization.The understanding, is familiar with other people research results,

Second: to continue to collect and analyse information. From the relevant journals, periodicals, books, and collecting further information on the network, filter out papers and related information, and sort. Understand and be familiar with the research results of others, and others found no depth of

Major cause of water pollution in this area is the river of a paper mill, the leakage of chemical substances