Abstract: With the development of eye movement，researchers have put forward some new models on the basis of many experiments，in which the SWIFT model is the most representative. These models are affected by the theory that is the guidance by attentional gradient. The SWIFT model has three principles: (1)lexical information processing is spatially distributed over an attentional window. (2)saccade timing is separated from saccade target selection. (3)saccade generation is an autonomous process with inhibition by foveal targets. The model has two parts: lexical processing and saccade programming

Key words: SWIFT model, the guidance by attentional gradient, distributed process of lexical information, inhibition by foveal targets