This thesis illustrates the key techniques and realizing technology on the process of system development and Tree of Assembly, database design, drawing browsing, file transfer, popedom management etc.

With the rapid development of computer technology, computer Aided Graphics (CAG) is now replacing traditional design, so, it is urgent to choose a suitable drawing software.

And then the math formulae for three dimensional moulding of a special section member with space curves have been derived which could be used for product design and development of drawing software.