Abstract: The transparent silica / phenolic resole hybrid material was prepared. The relationship between wavelength andtransmittances was measured by the single beam spectrophotometer. The films of the hybrid material and phenolic resole have different colors and transmittances within 460～780nm. The transmittances of the hybrid material film in the range of 460～780nm change with different wavelengths and cannot be compared if the wavelengths are different . The transmittances of phenolicresole decrease with the development of its curing. The transmittances of the hybrid material increase with the development of itscuring and may be a method to characterize the degree of curing of the hybrid material.