Abstract: A preliminary study of the design of the beam dump for the Dalian Advanced Light Source (DALS) was studied with the Monte Carlo simulation software FLUKA and the finite element software COMSOL. The modeling of the beam dump and the main building was carried out using FLUKA software. Both theoretical formulas and simulation calculations ensured that the energy deposited radially and axially in the beam dump was above 99%. The reduced variance technique was introduced in the calculation to reduce the statistical error of the calculation results, and the error of the corresponding calculation results was within 5%. To ensure the safety of the staff during the operation stage, the dose rates at the side walls and the top plate were calculated using FLUKA software simulations, and the dose rates at the two side walls were 1.84 μSv/h and 1.15 μSv/h, respectively, and the dose rate at the top plate was 1.45 μSv/h, which ensures the safety and health of the staff. Using the finite element software COMSOL, the maximum temperature of the beam dump under the steady state condition was 55.1 ℃, and the corresponding maximum thermal stress was 54.5 MPa, which are less than the melting point and yield strength of the material respectively. The stability of the beam dump during the operation of the device is ensured.