This paper introduces the Medium Access Control(MAC) procedure in brief, and proposes a scheme to realize the management of Resource Unit in the TD-SCDMA system, and gives the main procedure of the scheme, which will better implement the management and allocation of the resource unit.

Resource units were seamlessly integrated into the product development process so as to guarantee independence of design entity and resource units.

Through comparing three calculation modes of titrimetric analysis,a calculation method taking the chemical formula and its stoichiomotric number as the elementary entity is reasonable.

After description of current regionalization methods on natural disaster, this paper puts forward a new method which use the bottom--up region combination based on the basic unit theory.

Based on the theory of basic unit in natural disaster system, the paper took the agricultural natural disaster system of Hunan province as an example, and support of GIS,32 524 basic unit were divided in Hunan province.

According to the different stage of SC, the paper divides the reliability into two kinds: inherency and operation, gives out such a concept as basic unit and two kinds of analyzing method for reliability.

The designs of basic elements,section types and joints were introduced by a 28m span spatial grid example.