High　rainfall　environmental　conditions　can　easily　cause　erosion　or　collapse　of　the　granite　residual　soil　slope.　However,　traditional　slope　reinforcement　methods　have　drawbacks　such　as　poor　landscape　effect,　high　energy　consumption　of　raw　materials,　and　environmental　pollution.　This　study　studied　the　application　of　microbial-induced　calcite　precipitation　(MICP)　in　the　reinforcement　of　granite　residual　soil.　The　consolidation　effect　of　various　methods　was　investigated,　and　the　influence　of　cementing　liquid　concentration　and　pH　value　on　consolidation　under　optimal　curing　conditions　was　explored.　The　results　showed　that　the　bacteria　concentration　reached　OD600　=　3.0　and　urease　activity　was　31.64　mM/min,　which　positively　impact　the　production　of　calcium　carbonate　and　the　stability　of　crystal　morphology.　In　addition,　the　soaking　method　was　found　to　have　the　most　effective　consolidation　effect　on　the　surface　soil　samples,　with　the　lowest　disintegration　rate.　On　the　other　hand,　the　peristaltic　pump　grouting　method　is　the　most　effective　in　strengthening　depth.　This　method　resulted　in　a　513.65%　increase　in　unconfined　compressive　strength　(UCS),　a　297.98%　increase　in　cohesion,　and　a　101.75%　increase　in　internal　friction　angle.　This　study　also　found　that　after　seven　rounds　of　grouting,　the　highest　UCS　was　achieved　in　consolidated　soil　samples　with　a　0.5　mol/L　cementing　solution　concentration,　reaching　1.602　MPa.　The　UCS　of　soil　samples　increases　as　the　pH　value　of　the　cementing　fluid　increases　within　the　range　of　6-8.　As　the　pH　value　reaches　8-9,　the　strength　increases　and　stabilizes　gradually.　These　research　findings　can　serve　as　an　experimental　basis　for　strengthening　granite　residual　soil　slopes　and　a　guide　for　improving　microbial　geotechnical　strengthening　methods.