This article present a brief review on liming of paddy soils. It covers the effects of liming and process of waterlogging-drainage. on pH, Eh and reducing materials of paddy soils; and the effects of Liming on soil microbe, orkanic matter, nitrogen, phosphorus, potassium, microe-lements transformation, properties of soil physics and the growth of upland crops (such as barley, wheat) and rice in daddy field.From above, it could be concluded that litne is not necessary for rice production when soil pH is over 5.6, but when below 5.5 lime may be applied in comuination with apolication of organci manures before transplantation with consideration of soil buffer capacity. It's best to apply lime to upland crops in the rotation of paddy field.