The meshless natural element method(NEM) requires only nodes and a description of the external and internal boundaries
and no element connectivity is needed totally or partly. Therefore
meshless natural element method can be widely applied to crack propagation problems
elastoplastic analysis of materials and large deformation problems. Based on the summarization of the present literatures
the nature element method
which possesses the characters and advantages of the traditional finite element method and other meshless methods
has been studied further. And its application to elastoplastic problems is proposed and the basic principles of meshless natural element method are presented too. Finally
some special problems are given to verify the program designed according to the principles.