People in different socio-historical environments have varied perceptions of reality and truth.Realism,as a form of expression that aims to give a truthful representation of life,has engendered various techniques in tandem with the changes of society.This paper attempts to use Muriel Spark's The Driver's Seat as an exemplar to explore the relationship between postmodern experimental fictions and realism in post-war British literature.It argues that Spark's novels contain the idea of realism,being faithful to external objective reality.Meanwhile,they are able to penetrate the surface of society and grasp the deeper reality.In addition,Spark's work indicates her thinking about the relationship between the ideas of"fiction"and"reality".The Driver's Seat goes beyond traditional realism and points to new relationships between"fiction"and"reality",where they are intertwined instead of being separated.Spark's novels are instructive for understanding the relationship between experimental fictions and realism in the British context.