For high power package water-cooled radiator of 3D-Sip system and by using the finite element software ANSYS numerical simulation analysis of the geometrical parameters and fluid velocity affecting the performance of radiator cooling, the condition of air cooling water-cooled radiator fin thickness, spacing, and affect the performance of water cooled radiator cooling fluid flow curve is received.At the same time, water-cooled radiator outlet temperature of the inlet pressure and multi-objective optimization is based on the Pareto genetic algorithm.The results for high power 3D-Sip the design and system package of water-cooled radiator provides a certain basis.