The most known surrealist tecniques are the cadavre exquis and the photo collage. But there are more to discover.
Wikipedia has a list of surrealist tecniques with their definitions.
Collage by Dali. The Phenomena of Ecstasy, collage, Minotaure, no. 3/4, 1933
cadavre exquis von 1927: Yves Tanguy, Joan Miró, Max Morise, Man Ray
Enlace a técnicas surrealistas (Castellano):