In　order　to　investigate　the　effects　of　different　predrilled-hole　parameters　on　the　mechanical　behavior　of　micro-piles,　Pseudo-static　tests　on　five　predrilled-hole　micro-piles　were　carried　out　under　unidirectional　cyclic　displacement　load.　The　displacement-load　curves　and　distribution　of　bending　moment　and　displacement　are　analyzed.　The　test　results　indicated　that　the　smaller　the　stiffness　of　predrilled-hole　filler　is,　the　better　the　deformability　of　specimen　is.　The　stiffness　of　predrilled-hole　filler　has　significant　influence　on　the　displacement　and　bending　moment　of　pile　body.　Compared　with　the　shallow　predrilled-hole　specimen,　the　deep　predrilled-hole　specimen　has　lower　bearing　capacity,　but　its　deformability　and　bending　moment　are　larger.　The　larger　the　diameter　of　predrilled-hole　is,　the　larger　the　bending　moment　of　specimen　is.　The　larger　diameter　of　predrilled-hole　has　significant　effect　on　displacement　of　specimen.　The　deformability　of　predrilled-hole　specimen　is　improved　when　the　depth　and　diameter　of　predrilled-hole　exceed　3　times　of　pile　diameter.　©　2020　IEEE.