Being the functional basis of neural networks, neuronal signal integration has been currently becoming a hot point of neuroscience research. Active and passive membrane properties of retinal bipolar cells, temporal and spatial distribution of synaptic inputs to these cells are described, and modulation of signal integration characteristics of these cells under different retinal adaptation states is analyzed. In consideration of the functional and morphological properties of retinal bipolar cells, it is suggested that they may be an appropriate model for the study of neuronal signal integration.