Ordered self-organized complex oxide Ce:BaTiO3 quantum dots shaped as a pyramid with a square base were fabricated by pulsed laser deposition. The density of the quantum dots was about 140 μm-2. The nonlinear optical properties were determined by the single beam Z scan method at a wavelength of 0.532 μm with a laser duration of 10 ns. The nonlinear refractive indices of the wetting layer and the self-organized ordered quantum dots were 8.87×10-8 and 6.39×10-7 esu, respectively. The mechanisms of the nonlinear effect enhancement for these low-dimensional structures are discussed. © 1999 American Institute of Physics.