This experiment was carried out to determine the effects of soil phosphorus(P) level on growth environment of annual-and perennial plant. The results obtained are summarized as follow:1. With increasing level of phosphorus fertilizer, plant length of Italian-and perennial ryegrass tended to increase. 2. After the second year, DM yield of perennial ryegrass was significantly higher than that of Italian ryegrass in all treatments. 3. In the difference of P-yield between high P-treatment and nil P-treatment, there was tendency for that of Italian ryegrass to be increased but for perennial ryegrass to be decreased throughout 3 years. 4. The growth of perennial ryegrass compared with Italian ryegrass was tended to profitable in low phosphorus environment than high phosphorus environment.