Abstract: The study aims to evaluate the improvement effects of ridge culture and ridge culture with plastic film mulching, thus to provide scientific basis for soil fertility improvement in cold waterlogged paddy fields. Location experiment was conducted to study the effects of ridge culture and ridge culture with plastic film mulching on soil temperature, soil water stable aggregate content, reducing substances, organic matter oxidation stability coefficient and rice yield. Compared with the conventional tillage treatment, the treatments of ridge culture and ridge culture with plastic film mulching could both improve the rice yield, and the average yield of 3 years increased by 4.9%-16.8%. Ridge culture with plastic film mulching was more effective in improving rice yield, could improve soil temperature in early period of rice growth, the temperature-increasing effect of ridge culture with plastic film mulching was better than single ridge culture. The ridge culture with plastic film mulching could improve ＞0.25 mm soil water stable aggregate content, the treatment of single ridge culture improved ＞1 mm soil water stable aggregate content significantly, while the treatment of ridge culture with plastic film mulching improved 0.5-1 mm soil water stable aggregate content significantly. Single ridge culture could decrease the contents of reducing substances, field water management and rice growth period affected the reduction effect of ridge culture with plastic film mulching on the contents of reducing substances. Therefore, single ridge culture and ridge culture with plastic film mulching could reduce organic matter oxidation stability coefficient, increase the content of readily oxidized organic matter, and enhance organic matter mineralization. They both could improve soil properties and rice yield, and the improvement effects of ridge culture with plastic film mulching was better than single ridge culture.