The necessity of developing the envelop design software is discussed firstly in this paper. To develop the software, key technologies and problems are pointed out. After the software developed, we use it to solve several types of problems. By doing these, we come to the conclusion that the efficient envelop soft which waremeets our requirements in the function, and the result is correct.

The new specification version PKPM2010 design software V2.1 version has been published. A lot of test and trial showed that the new version of the software's analytical ability, efficiency have been improved dramatically. It is more close to the design requirements, and the operation of the software interface more friendlily. This paper introduced the improvement of software structure V2.1 version of the technology and the new feature, which provide a reference for the design personnel.

One of the most important problems in the design procedure of space structures is how to get rational shapes of freeform surfaces. Based on the concept of structural morphology, the fabrication of freeform surfaces can be combined to the method of pursuing optimal structures with rational mechanical performance, which can be defined as computational morphogenesis. In this paper, some concepts of structural morphology are introduced and some key problems are discussed simultaneously.The key problems can be abstracted as follows:Firstly, how to fabricate freeform surfaces?Secondly, what kind of generating methods are feasible for rational freeform structures. By discussing the questions above, some advices are proposed finally.