Abstract: In order to enhance liquid diffusion properties in horizontal direction of the melt blown materials with microfibers. The samples of PEG/PP melt blown microfiber materials were made by the polyethylene glycol (PEG) modified polypropylene (PP) with blend-modification. The fiber fineness distribution, arrangement morphology, the upper and lower wetting time and the moisture welts area tested were tested. The results show that, fibers with different fineness are random distributed in horizontal direction, and multiple nanofibers attach the microfibers, which forming the horizontal branching structure. The fibers above 2000Nm form the primary branches, the microfibers with 800-2000nm consist the second branches, and the nanofibers below 800nm compose the third branches. The network density of the third branches can be adjust from the 1.86 to 4.20 by increasing the ratio of PEG (0%~20%) and melt spinning temperature (230~250 C). The upper and lower wetting time and moisture welts area vary with network density of the third branches, the upper wetting time decreases from 3.234s to 2.215s with network density increase from 1.86 to 4.2.