In this study, modified catalytic chemical vapor deposition (CCVD) method was applied to control the CNTs (carbon nanotubes) growth. Since titanium (Ti) substrate and iron (Fe) catalysts react one another and form a new phase ($Fe_2TiO_5$) above $700^{circ}C$, the decrease of CNT yield above $800^{circ}C$ where methane gas decomposes is inevitable under common CCVD method. Therefore, we synthesized CNTs on the Ti substrate by dividing the tube furnace into two sections (left and right) and heating them to different temperatures each. The reactant gas flew through from the end of the right tube furnace while the Ti substrate was placed in the center of the left tube furnace. When the CNT growth temperature was set $700/950^{circ}C$ (left/right), CNTs with high yield were observed. Also, by examining the micro-structure of CNTs of $700/950^{circ}C$, it was confirmed that CNTs show the bamboo-like structure.