Radionuclide migration numerical model in surface water is now being developed for evaluating long-term behavior of radioactive materials released into aquatic environment from a nuclear accident. Data of distribution coefficient (K_d) and concentration factor (CF) were gathered and constructed with database (DB) for an environmental media to use with the basic input parameter of radionuclide migration model in surface water environment. Also, a data loader module has been developed using the C language in Linux system, and it was composed of link with the radionuclide migration model efficiently for easy utilization. Developed data loader module was verified through the process of configuring DB file again after reading each data in DB. A data loader module will be updated by aquisition new data set from International Atomic Energy Agency.