One-phase-low-pH　MICP　(Microbially　Induced　Carbonate　Precipitation)　or　EICP　(Enzyme　Induced　Carbonate　Precipitation)　is　a　new　biocementation　method　for　soil　improvement.　This　method　uses　the　low　pH　of　bacterial　or　urease　solution　to　provide　a　delay　for　the　MICP　or　EICP　process　so　that　the　treatment　solution　can　be　evenly　distributed　in　soil　during　grouting.　However,　how　are　the　delay　duration　and　the　effect　of　biocementation　affected　by　the　initial　pH　(pH(0))　of　bacterial　or　urease　solution　has　not　been　studied.　In　this　paper,　an　experimental　study　using　different　pH(0)　of　urease　(or　bacterial)　solution　for　EICP　(or　MICP)　biocementation　is　presented.　The　study　shows　that　the　lower　the　pH(0),　the　longer　the　delay　period.　However,　the　EICP　or　MICP　process　becomes　ineffective　when　the　pH(0)　is　equal　to　or　lower　than　4.5　or　4.0　for　EICP　and　MICP,　respectively.　The　pH(0)　also　has　a　significant　effect　on　the　strength　of　treated　sand　by　affecting　the　morphology　and　crystallinity　of　precipitated　calcium　carbonate　crystals.　The　pH(0)　on　the　other　hand,　has　little　effect　on　the　amount　of　calcium　carbonate　production　and　its　distribution　in　soil　as　long　as　the　delay　duration　is　sufficient　for　the　distribution　of　treatment　solution　in　soil.