The effects of chlorophyll content, photosynthetic rate and constitution factor of yangmai 12 under different seedling rates, row spacing and nitrogen strategies were studied in rice cultivation condition. The results showed that the chlorophyll content of wheat at later stage with basal application of all nitrogen fertilizer was obviously lower than that under the total amount of nitrogen application of 150-300 kg·hm^-2with base nitrogen proportion of 60%, and topdressing of 40% at the stage of foliar age remainder 1. The output of wheat grown under basic seedling of 2 250 000 per hm² was significant higher than that grown under basic seedling of 3 000 000 per hm² and 3 750 000 per hm².