[Objective] The influences of soil bulk density on point source infiltration in gravel-sand mulched field were studied in order to provide basis for the development of drip irrigation technique in sandy area. [Methods] Bare land(no vegetation and sand mulch) was selected as the contrast group(CK). Based on laboratory simulation experiment

this article studied the influences of different soil bulk density(1.23 g/cm3

1.38 g/cm3

1.53 g/cm3) on point source infiltration pattern in gravel-sand with different planting years(new gravel-sand mulched field

middle gravel-sand mulched field

old gravel-sand mulched field). [Results] The point source vertical cumulative infiltration showed a negative correlation with soil bulk density and planting years. Soil bulk density showed no significant effect on the infiltration depth in the initial period of infiltration. While infiltration depth were significantly influenced by the density as the infiltration reached the soil

and bulk density decreased with the increase of infiltration depths. Horizontal infiltration distance of CK increased with the increase of soil bulk density

while the change of horizon infiltration of gravel-sand mulched field was not obvious. The moist body aspect ratio was represented with λ

the λ of CK and sand mulch soil decreased with the increase of soil bulk density. When sand mulch soil bulk density was constant

λ decreased with the increase of planting years. The λ of CK increased with the increase of infiltration time in the initial days of infiltration and then became stable. The λ of sand mulch soil increased significantly with the increase of infiltration time in the initial minutes of infiltration

while it decreased when infiltration reached the soil

and the increase of λ was not obvious in the late minutes. [Conclusion] Gravel-sand mulch promote the vertical cumulative infiltration of soil moisture

and point source vertical cumulative infiltration show a negative correlation with soil bulk density and planting years.