A composition inhibiting MEIS proteins. The MEIS proteins are effective in proliferation of hematopoietic stem cells. A formulation capable of easily passing through the cell membrane and perform its activity in the cell, and can inhibit MEIS activity in a dose dependent manner. The combination includes isolated cells, medium, growth factors and MEISi inhibitor. The isolated cells are isolated from mouse bone marrow, human bone marrow and human umbilical cord blood. The medium has a pH value of 7.2 and contains bovine serum albumin, recombinant insulin, transferrin, 2-mercaptoethanol and IMDM medium. The growth factors are hematopoietic stem cell factor SCF, fetus liver tyrosine kinase-3 ligand Flt3L, and thrombopoietin. A chemical formula of the MEISi-1 is 4-[2-(benzylamino)-2-oxoethoxy]-N-(2,3-dimethylphenyl) benzamide. A chemical formula of MEISi-2 is 4-hydroxy-N′；-[(Z)-(2-oxonaphthalen-1-ylidene)methyl] benzohydrazide.
