Abstract: Pollen tube formation is a good and simple model of growth and development. During pollination, a pollen tube emerges from the hydrated pollen grain, penetrates the stigma surface, traverses the transmitting tract and finally reaches the ovule for fertilization. This complicated and tightly controlled process presumably involves signaling between the pollen tube and the pistil. In this review, several subjects about pollen hydration, pollen germination (in vivo and in vitro), pollen tube wall structure and growth, incompatibility and pollen tube growth, the role of Ca+2 in pollen tube growth, pollen tube and pistil interactions will be discussed briefly.