Abstract: Under the conditions of the higher surface pressure and deposition speed, ordered organic/CdSnanoparticles complex film was prepared by the reaction of cadmium stearate and H₂S."All trans" conformation of -CH₂- can be kept well after reaction which is thought to form nanoorder organic-inorganic superlattice material.Bragg (001) diffraction peaks can be observed by means of X-ray diffraction related to 5.02 nm of the long period.The order property of LBcomplex film was shown according to the result of infrared spectrum.The band gap (E_g) of CdSnanoparticle is 3.46 eVwhich increases 1- 04 eVcomparable to that of the bulk material(2.42 eV) from the result of UV-Vis spectrurn.

Key words: Q-CdS, Langmuir－Blodgett film, Vertical superlattice