Topdressing is an important link in the turfgrass management. The method of pot culture is used in order to investigate whether or not phosphatic fertilizer is necessary and the proper application rate of the fertilizer during the period of plant growth. The study is carried out to examine the effects of different dosages phosphatic fertilizer (0, 30kg/hm², and 60kg/hm² P₂O₅) on the growth and photosynthetic attributes of zoysiagrass (Zoysia japonica). The results show that treatments of 30g/hm² and 60kg/hm² P₂O₅ significantly increase the above and under ground biomass of zoysiagrass compared with controls. 30kg/hm² P₂O₅ treatment increases the contents of soluble protein, soluble sugar, and praline of zoysiagrass leafs, while 60kg/hm² P₂O₅ treatment decreases the content. Treatments of 30 kg/hm² and 60kg/hm² P₂O₅ enhance chlorophyll contents, net photosynthetic rate, stomatal conduction, transpiration rate, maximum photo quantum efficiency, and the electron transfer rate compared with controls, however decrease water use efficiency. During growth period, phosphatic fertilizer promotes the growth and development of zoysiagrass, improving the turfgrass quality of zoysiagrass. Every indicator of 30kg/hm² dosage phosphatic fertilizer is better than that of 60kg/hm² dosage phosphatic fertilizer.