Abstract: After World War I,along with the comedown of the power of Britain and the upsurge of the liberation movement in the colonies,Great Britain adjusted the policy about Dominions,making the relations between the Kingdom and the Dominions appear new change.On the political,Dominions got the equal position and the British Empire changed into the British Commonwealth gradually;on the economy,Great Britain got with Dominions to establish the Empire Preference System together,but its influence Febreasing gradually;o...