Abstract: To explore effective humidifying methods for disorderly filled loess foundation with low water content, comparative field experiments using three different water injection schemes were conducted on water injection based humidification in the fill area of a construction project in Lanzhou New Area, and the humidification effects of the three different experimental methods were analyzed. The experimental results show that all the maximum humidification depths of the three water injection methods did not reach the designed wetting depths. This is primarily attributed to the loose internal structure and significant pore networks within the disorderly filled foundation, which caused preferential water migration along dominant seepage channels. Utilizing three different hole depth (i.e. 6 m, 13 m, and 21 m) for water injection based humidification, water content distribution is most uniform, and thus the humidification effect is best. Moreover, the required water injection amount per unit area based on three different hole depth is least, only 1.61 m³/m², which is 62% and 34% less compared with the other two test schemes, respectively.