s How to get pattern elements is a bottle neck problem all the while in the computer aided pattern design system. Firstly

this paper introduces the principle of synthetic reasoning and defines its three components:synthetic source S

synthetic constraint C

synthetic result R. Secondly

it discusses a way of the pattern element transformation and generation based on the synthetic reasoning. Thirdly

based on eigenvector

this paper present the pattern element generation model with very simple field strength function of components. Because this model is simple

intuitional and coincident with the data structure of synthetic source and result

the implementation is relatively easy and the effect is fairly good. Then some examples are presented. Finally

this paper proposes some evaluation and some suggestion about advanced research in the future. On all accounts

this method can use the visual information of acquired pattern elements

under some special requests

to produce new ones rapidly or transform them to other conformations

which will amplify greatly the resource of pattern elements and resolve forenamed problem at a certain extent.