Abstract: This paper states the research about the changes of bamboo seedlings, the relation between environmental factors and the changes of both biomass and photosynthetic rate. And some progress has been made.1.The height, the length of roots and biomass of the cultivated seedlings in nurseries with better condition are better than those in nurseries with poorer condition. The biomass of the potted seedlings manured is 3 times more than that of not having been manured.2.(1) The light saturation point and compensation point of the seedlings arel ower than those adult bamboos while observing from the measurement of light and the curve of light intensity of single leaf. (2) Under the normal conditions of the density of light quantum current, the photosynthetic rate of single leaf is low in the early morning and evening, and is the highest at 10 in the morning. And small concaves will appear on the curve at about 1 p.m.. Under a low density of light quantum current when the changes of other factors are smaller, the changes of photosynthetic rate (Pn) are mainly affected by light quantum current (Q) (If Q rises up, Pn will increase. On the contrary, Pn will decrease).The results show that if the method of measuring the photosynthesis will be adopted, during the stage of cultivating through effective identification of some management techniques, seedlings cultivated in nurseries have the advantages of small amount of work, a short cycle and precise data over those cultivated in the fields.