Abstract: Based on the analysis of moving platform and vision identification techniques, error source model was proposed to enhance the assembly precision of low density foam column belonged to dynamic hohlraum. Error sources transmission models of design, machining and assembling processes were established, respectively. Moreover, the impact factor of assembly precision influenced by error sources was captured from the prediction model of coaxial degree and axial angle of low density foam column. Finally, a type of dynamic hohlraum was given for demonstrating the effectiveness of the prediction model. When the adhesive random position error of foam column was relatively small, coaxial deviation between predicted value and measured value was from 0.01 mm to 0.03 mm, and axial angle deviation was from 0.05 to 0.34. It is proved that the methods can provide theoretical foundation for assembly precision prediction and error sources control in the assembly process of low density foam column.