The invention discloses rendering method and system thereof. The rendering method comprises the following steps of: respectively producing two view transfer matrixes corresponding to left and right eyes according to attributes of two preset virtual cameras; respectively carrying out projection transfer on the left and the right eye views by using the two view transfer matrixes so as to respectively project the left and the right eye views into two projection windows; and transferring the contents in the two projection windows from projection coordinates into screen coordinates according to the parameters of a screen display area so as to respectively display the left and the right eye views in two viewports of the screen. By respectively displaying the left and the right eye views in the two viewports of the screen to realize three-dimensional display, the rendering method and the system thereof have the advantages of good commonality, easy realization and low cost, and can be widely applied to the field of video reality simulation. The rendering method and the system thereof not only can obviously enhance the feeling of users, but also can greatly promote the development of the field of video reality simulation.