Simon is often identified with the nouveau roman movement exemplified in the works of Alain Robbe-Grillet and Michel Butor, and while his fragmented narratives certainly contain some of the formal disruption characteristic of that movement (in particular Triptyque from 1973), he nevertheless retains a strong sense of narrative and character. In fact, Simon arguably has much more in common with his Modernist predecessors than with his contemporaries; in particular, the works of Marcel Proust and William Faulkner are a clear influence. Simon's use of self-consciously long sentences (often stretching across many pages and with parentheses sometimes interrupting a clause which is only completed pages later) can be seen to reference Proust's own style, and Simon morever makes use of certain Proustian settings (in La Route des Flandres, for example, the narrator's captain de Reixach is shot by a sniper concealed behind a hawthorn hedge or haie d'aubépines, a reference to the meeting between Gilberte and the narrator across a hawthorn hedge in Proust's A la recherche du temps perdu). The Faulknerian influence is evident in the novels' extensive use of a fractured timelime with frequent and potentially disorienting analepsis (moments of chronological discontinuity), and of an extreme form of free indirect speech in which narrative voices (often unidentified) and streams of consciousness bleed into the words of the narrator. The ghost of Faulkner looms particularly large in 1989's L'Acacia, which uses a number of non-sequential calendar dates covering a wide chronological period in lieu of chapter headings, a device borrowed from Faulkner's The Sound and the Fury.

Despite these influences, Simon's work is thematically and stylistically highly original. War is a constant and central theme (indeed it is present in one form or another in almost all of Simon's published works), and Simon often contrasts various individuals' experiences of different historical conflicts in a single novel; the Great War and the Second World War in L'Acacia (which also takes into account the impact of war on the widows of soldiers), the French Revolutionary Wars and the Second World War in Les Géorgiques. In addition, many of the novels deal with the notion of family history, those myths and legends which are passed down through generations and which conspire in Simon's work to affect the protagonists' lives. In this regard, the novels make use of a number of leitmotifs which recur in different combinations between novels (a technique also employed by Marguerite Duras), in particular the suicide of an eighteenth-century ancestor and the death of a contemporary relative by sniper-fire. Finally, almost all of Simon's novels feature horses; Simon was himself an accomplished equestrian, and fought in a mounted regiment during WWII (the ridiculousness of mounted soldiers fighting in a mechanised war is a major theme of La Route des Flandres and Les Géorgiques).

Simon's principal obsession, however, is with the ways in which humans experience time (another Modernist fascination). The novels often dwell on images of old-age, such as the decaying 'LSM' or the old woman (that 'flaccid and ectoplasmic Cassandra') in Les Géorgiques, which are frequently seen through the uncomprehending eyes of childhood. Simon's use of family history equally attempts to show how individuals exist in history...that is, how they might feel implicated in the lives and stories of their ancestors who died long ago.

• Karen L. Gould, Claude Simon’s Mythic Muse (French Literature Publications, 1979). ISBN 978-9996779565
• Orion Blinded: Essays on Claude Simon. Karen L. Gould and R. Birn, editors. (Bucknell University Press, 1981).

"Cavalrymen Pitted Against Tanks (Claude Simon)", 'Paths to Contemporary French Literature', volume 1, by John Taylor, New Brunswick, New Jersey: Transaction Publishers, 2004, pp. 163—172.