Through research on the agricultural economy of Hai Duong province colonial period (1883 - 1945), the thesis contributes a specific perspective, more comprehensive agricultural economy of the colonial period in North Delta. Based on that assessment in an objective, science on the effects of French colonial policy to the agricultural economy of Hai Duong and draw lessons for the work of construction, agricultural development, rural innovation and improve people s lives and contribute to successful implementation of the innovation of the Party and State. | The transformation of the agricultural economy has a major impact on the increase in population and migration flows and vice versa. Hai Duong population from 1900 to 1943 increased by about 138,000 people. The population density of 314 people / km2 (1900) rose to 375 people / km2 (1943). Cultivation area from hectares per capita / person (1932) rose ha / person (1940). However, rice production per capita on average in Hai Duong province decreased from kg / person (1932) to kg / person (1940). This suggests that rice production can not meet the population growth rate. This is also the reason why poverty, the growing impoverishment of working people in Hai Duong province. Also leading to the formation of new migration flows: migration from the plains to the north of the province; migrants in factories, mines; migration to other provinces; immigrants in South America, Cambodia, . However, this migration has yet to satisfy the employment needs of farmers in Hai Duong province. Also, the concentration of population in the eastern plains of the province have not been adequately addressed.