This paper discusses the present situation of document management in office, explains the necessity of managing office documents by files and how to carry out managing by files and points out problems in managing office document by files.

Points out that the effective control of documents is the fundamental factor in the whole quality control system, focusing on the sponsoring, management and record of documents and the transformation of alien ones.

The paper makes an exhaustive analysis to the hydrologic property of sediment in the lower reaches of the BeiJiang River by using a great deal real measured hydrologic data.

This paper analyzed the hydrologic data characteristics and the concerned application in soil and water conservation in China.

This paper presents a computer process with the problem of “rounding off to the nearest whole number” solved in hydrologic data, which has the characteristics of simplicity, generality and easy-operability, and can be directly used to calculate and process various hydrologic data.

Discussion on some questions in execution of 《hydrological data reoganization standard》;

Based on real hydrological data of precipitation amount, monthly average water level, flow rate and sand carrying capacity in Shi jie and San sui Hydrologic stations, this paper gives an analysis of the water regime of Beijiang s lower reaches.

A new method gray relation method,which is used to analyze the quality of the hydrological data,is discussed and the example of the method is given together.

This paper introduces three major channels for retrieval of the materials of academic papers, and makes major analysis on and comparison of suitable material selection of relative retrieving tools and retrieval points.