The documentary of Trapang Thmar will illustrate how Cambodian people forced to work day-night to create a big dam for agriculture at the northwest of Cambodia, Ang Trapang Thmar, Phnom Srok District, Banteay Meanchey province. This documentary will cover the story of workers at Ang Trapeang Thmor who survived from overload working and starving in the Khmer Rouge Regime, working overtime. However, we want to rise understanding about place of significant of history of Trapang Thmar which is buried day to day as it is now always mentioned as a place to see water bird rather than to understand its history. Also, the construction of this forces labour with lost of thousand people has provided thousand of benefit for people today.