This experiment was undertaken on Chico Farm of Chiayi Agricultrual Experiment Station, during the first and the second crop season in the year of 2000. It was to explore the feasibility to apply chlorophyll meter to predict nitrogen status of rice plant during different crop seasons at various growth stages. The result shows that nitrogen content of rice plant decreased with growth days, which applies to conditions of different nitrogen rates, planting densities and crop seasons. As for the variation of nitrogen content on rice leaf, it performed mostly similar to the variation of nitrogen content on rice plant and also presented the content was more on loose-planted than on densely-planted, more on high nitrogen rate than on low nitrogen rate. The relation between the nitrogen content of rice plant and leaf blade on participating varieties are highly positive correlation on different growth stages in the two crop seasons and the correlation coefficients are all over 0.9. Except the most tillering stage and the heading during second crop season (R^2＞0.4), the coefficients of determination (R^2) of the linear regression analysis of nitrogen content of leaf blade and rice plant on SPAD reading value were all greater the 0.6.