This paper deals with basic Theory and programing of macroelement method. A big cosntruction may be divided in to many macroelements. Than macroelement may be divided in to many finite elements. Because such macroelements are same. We can see that a macroelements is a big finite element. For example the constructions along the windows of railway passenger car body are same (see Fig 2). We can see that those constructions are macroelements and only put one of them into memory. Also we need only one time assemble of the stifness matrix of those constructions. So we can economize memory and calculation time of computer. The basic equation of macroelement method only consist the freedom of bondary nodes of macroelement, which is much times less than the equation of finite element method. So the operation of inverse matrix is much times quickly and more precision. In this paper also give an example of calculation of a railway passenger car body using macroelement method with it's result and compare with calculation of passenger car body using finit-element method.
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