Growth limiting factors influencing the high density cultivation of insect cells were studied. A stationary phase in Grace’s medium was found to be due to the deprivation of the active form of FBS components. Various compounds were added in the early stationary phase to observe the recovery of cell growth. With the addition of yeastolate, final cell densities were 4-fold and 3.5-fold higher in monolayer and suspension cultures, respectively. Pluronic F-68 increases the specific growth rate and the growth yield of the cell as well as protects the cell from the shear damage.