Abstract: In order to overcome the poor bond performance of macro-synthetic polypropylene fiber/cement matrix，macro-synthetic polypropylene fiber was soaked in polyacrylamide solution，and fiber pullout test，microhardness test，X-ray diffraction analysis and scanning electron microscopy analysis were subsequently carried out to evaluate the effect of polyacrylamide on the interfacial properties of fiber/cement matrix． The results show that fiber/matrix interfacial bond properties improve due to the treatment with polyacrylamide solution; for instance，the fiber pullout curve becomes fuller and the interfacial debond postpones． Moreover，significant improvement can be observed with the increase of polyacrylamide content in the solution． It is also found from microanalysis that the treatment results in a decrease of CH crystal in the interfacial region，an increase of interface microhardness，a thinner transition lay-er as well as a densified hydration products structure with alternate CH，C-S-H and AFt． Thus，the weak area be-tween the fiber and the cement matrix improves significantly．

Key words: macro-synthetic fiber, polyacrylamide, fiber/matrix interfacial property