研究了时空非相干椭圆形高斯光束在饱和对数型非线性介质中的自陷行为，得到了孤子的形成条件并分析了其相干特性，讨论了光束自陷的变化形式，发现光束的初态和材料非线性对其有决定性的影响，并进一步获得了光束半径和光束相干半径的解析表达式，发现光束的相干特性不但会随传播距离产生周期性的变化，且随组份频率的增大而减弱．

The propagation of elliptic Gaussian spatiotemporal incoherent beam in logarithmically saturable noninstantaneous nonlinear media is studied by using the mutual spectral density theory. The existing condition and the analytical expression of the beam radii and the coherence radii of spatiotemporal incoherent solitons are obtained. The initial condition of the beam and the nonlinearity of the media decide the propagation of the beam. It is find that the coherence properties of beam evolve periodically with the distance and the spatial correlation distance is smaller for higher frequency constituents of the incoherent light.