Structural study on deformed plutons, attempted to determine the strain type, strain patterns and strain history within and around intrusions may be as a guide to explore the emplacement mechanism of granites. The main methods available in structural geology are briefly reviewed and examples of recent study of emplacement mechanism of plutons in different tectonic settings are briefly described. It is emphasized that the tectonical stress, in combination with the natural bouyancy and ascending tendency of magmas, can generate the varied emplacement mechanisms of granites.