This essay discusses the intricate formation of the British national character through a historical lens, and put forwards a view that it is combined by two contradictory elementsconservatism and radicalism on the basis of adequate historical facts and personal reflection. By illustrating with historical facts, the essay reveals the lasting traits of British conservatism, which is evident in steadfast attachments to monarchy and deep-seated respect for legal traditions. Despite periods of upheaval, such as the Glorious Revolution, the British have showed a resilience in preserving established norms and structures, which reflect a pragmatic approach to social evolution. On a contrary, the essay also demonstrates radical impulses that have propelled transformative movements for political and social equality in British history, from the Peasants' Revolt to the suffragette campaigns. Through this dialectic, British national character emerges as a dynamic synthesis of tradition and transformation, conservatism and radicalism, where ruling elites navigate change with pragmatic conservatism while social masses champion radical progress.