Abstract: The effects on growing and yield of cucumber by spraying mixture of uniconazole and rare earth with different concentration at the beginning of efflorescence were preliminary studied. The results showed as follows, reduced plant height of cucumber, delayed senility. Furthermore, it increased specific leaf weight and chlorophyll content, and enhanced photosynthesis rate as well during producing fruit phase. The mixture that was A3B2 mixed compound was the best in all, and increased significantly yield of cucumber by 27.04 percent. The mixture treatment increased yield of cucumber significantly by increasing weight of single cucumber and fruit number of per plant secondly.