NOVELTY - A carbon nano-tube freeze dried body/metal oxide composition comprises manganese dioxide, tin oxide or titanium oxide as metal oxide, where after freezing and drying, the nano-tube is used as continuous matrix to take part in the reaction, the upper part is a sheet or a chip composite metal oxide, and after reaction, a macroscopic and microscopic continuous network structure is formed.    USE - As carbon nano-tube freeze dried body/metal oxide composition (claimed) used in super capacitor, lithium ion battery, a solar battery, photo-catalysis.    ADVANTAGE - The carbon nano-tube freeze dried body/metal oxide composition can promote electron transfer and increases the photovoltaic conversion efficiency on the semiconductor metal oxide of dye-sensitized solar cell. The method can control the uniform distribution of a compound through simple liquid phase and simple adjusting synthesis parameters, has short process flow, stable process, mild reaction condition and low cost.    DETAILED DESCRIPTION - A carbon nano-tube freeze dried body/metal oxide composition comprises manganese dioxide (MnO2), tin oxide (SnO2) or titanium oxide (TiO2) as metal oxide, where after freezing and drying, the nano-tube is used as continuous matrix to take part in the reaction, the upper part is a sheet or a chip composite metal oxide and after reaction, a macroscopic and microscopic continuous network structure is formed. The carbon nano-tube freeze dried/metal oxide composition is prepared by: 1) hydrothermal synthesis method: a) arranging carbon nano-tube in polyfluorotetraethylene stainless steel reaction kettle, freezing and drying carbon nano-tube body (MnO2) complex by adding the reaction solvent selected from potassium permanganate (KMnO4) and/or manganese sulfate (MnSO4); or freezing and drying carbon nano-tube body (SnO2) complex by using mixed solution of tin tetrachloride (SnCl4) and sodium hydroxide (NaOH) as reaction solvent; or freezing and drying carbon nano-tube body (TiO2) complex by using tetrabutyl titanate as solvent, the hydro-thermal reaction solvent is a mixed solvent with mol ratio of 1:10 to 10:1, and the ratio of solvent to freeze-dried carbon nano-tube body is 0:1-8:1, b) taking the reactant in polytetrafluoroethylene sealing stainless steel reaction kettle, putting in the constant temperature drying box for hydro-thermal reaction, the temperature is between room temperature and 180 degrees C, hydrothermal time is 1-24 hours, the volume ratio is not greater than 80%, c) reacting the hydro-thermal reaction product with metal hydroxide, calcining at 200-500 degrees C, and transferring to metal oxide, and obtaining carbon nano-tube freeze dried body/metal oxide compound; 2) alcohol salt hydrolyzing method suitable for the TiO2 metal oxide and carbon nano-tube composite freeze drying: a1) freezing and drying the carbon nanotube for heat treatment, and removing the carbon nano-tube, b1) freezing and drying the carbon nano-tube by dipping body in metal alkoxide using tetrabutyl titanate alcohol salt; metal alkoxide hydrolysis and polycondensation on the carbon nano tube; freeze drying of the substrate, freezing and drying the sheet-shaped structure or the surface and composed of alcohol salt of metal element corresponding to hydroxide deposit, immersing the metal alkoxide solution to carbon nano-tube; freezing and drying the metal oxide with the carbon nanotube composite, the mass ratio can be controlled through adjusting the metal alcohol salt concentration to 0:1-8:1, the reaction product is separated by liquid-solid, drying and calcining process, freezing and drying to obtain carbon nano tube/metal oxide compound; 3) liquid phase reduction method, which is suitable for MnO2, SnO2 or TiO2 metal oxide and carbon nano-tube composite, freeze drying: a2) freeze drying the carbon nano-tube for heat treatment, removing the carbon nano-tube, activating freeze-dried carbon nano-tube body in nitric acid (HNO3) solution (4-16 mol/l); b2) forming metal oxide solution using oxidant and reducing agent, where the concentration ratio of oxidizing agent and reducing agent is 1:10-10:1, where the total volume of the solution to completely immerse the carbon nano-tube for freezing and drying the metal oxide and carbon nano-tube freeze drying compound, mass ratio can be controlled through adjusting the concentration of the reaction solvent to 1-8:1; c2) freezing and drying the carbon nano-tube body after dipping in step (b2) of oxidizing agent and reducing agent solution, absorbing solution on the carbon nano-tube dried sheet in ion of oxidation-reduction reaction for synthesizing freeze dried/metal oxide compound.