Kala-azar i.e. Visceral Leishmaniasis has been found to be a big social problem among most of the population of Bihar. The cure of this disease is very costly and due to this, the death rate has been found to be very high especially among the poor population. The main objective of the field survey has been to determine the rate of endemicity in the affected areas and to know the special and general features of such areas regarding the geographical conditions, micro and macro environmental conditions. The types of people living including their life-styles, sanitation and socio-economic conditions have also been targeted as focus points during the field survey. KA cases and deaths have been observed to be closely related to the socio-economic conditions of the affected areas, its study and implementation may lead to fruitful method to control the Kala-azar epidemic.