This book is the masterpiece of the famous English political activist and political scholar James Bryce. It is published in 1921. Based on his own political experience and investigation conclusions, the author conducts a profound analysis on the democratic regime of France, Switzerland, the United States of America, Canada, Australia and New Zealand, and comprehensively summarizes the connotation, trend, advantages and disadvantages of democratic system. It is called the most advantageous defense for the modern democracy.