Introduction: "The book consists of 3 volumes introducing the basic information about the country and people of Laos and its people, about the basic characteristics of Laos through the fields of history - military, politics - economy and culture - society, compared with the characteristics of the country and people of Vietnam. Besides, the book also analyzes the past, current and prospects of connectivity in all areas of Vietnam-Laos relations. This will help to effectively implement the plan of cooperation between the two countries in the future, and also to realize Vietnam's foreign policy towards Laos." This book contains the following main contents: 1. Relations between Vietnam and Laos (1954-1964). 2. Viet Nam - Laos unite against the US salvation (1964-1973). 3. Viet Nam - Laos nite in the last phase of national democratic revolution in Laos (1973-1975). 4. Special comprehensive cooperation Vietnam - Laos (1976-1990). 5. Vietnam - Laos comprehensive cooperation (1991-2000). 6. Vietnam - Laos comprehensive cooperation (2001-2017).