Quantitative neutron digital imaging is an important means of NDT(Non-destructive Testing) and NDE(Non-destructive Evaluation).Scattering neutrons have an adverse effect to quality of neutron images when quantitative analysis has to be made in NDT.For quantitative neutron imaging instrument

the principle of imaging degradation caused by neutron scattering is analyzed

and the scattering degradation process is represented by the supposition of PSF(Point Spread Function) superposition.On the basis of constructed PSF model of neutron imaging

a space-domain iterative algorithm applied to scattering correction for this instrument is proposed.The result shows that after correction

for different shapes of H2O samples at different sample-to-detector distances

the scattering component affecting imaging quality of the instrument is apparently restrained

and thickness of the samples evaluated from the processed image approaches their real thickness.This algorithm proves to be practical and effective.