Abstract: Field trials were conducted in July 2019 to test the weed control effect of herbicides such as Laishijing and Rifit in machine planting rice fields. The results showed that it would achieve good effect if 70ml Rifit was used in per 667 m2 sealed soil to prevent and treat grassy weeds before machine planting. During rice growth period, it can be used with other desealants interchangeably. Laishijing is better to prevent and treat old barnyard grass. In the meantime, to prevent and treat old barnyard grass and old Asian sprangletop in machine planting rice field, combinations of Laishijing plus 300ml 100g/L Qianjin, and Laishijing plus 250ml 60g/L Daoxi can achieve effectiveness higher than 90%. Florpyrauxifen might cause the leaves of remaining barnyard grass and Asian sprangletop to curl. Both Laishijing and Rifit are safe to rice. Key words: Laishijing; Rifit; weeds in machine planting rice fields; control effect; safety