Most of the material included in this book is the first published. Up to now, there have been many research projects on this revolutionary period, but there has not been any research on the democratic national movement in Cochin china period 1930-1945 based on the documents of the French colonial government issued in 1930-1945 that are currently preserved in the archives. It is the new research direction of the book 'Democratic nationalist movement in Southern Vietnam 1930 - 1945 studied through archives' compiled by Dr. Pham Thi Hue. The book contains the following main contents: 1. Democratic national movement in Cochin china in the period 1930-1935; 2. Democratic campaign in Cochin china during 1936 - 1939; 3. The campaign for national liberation in Cochinchina during the period 1939 - 1945.