At three different planting densities,a set of index numbers of Liaoza 13 such as plant height,stem diameter,the number of leaves,leaf area index(LAI),SPAD,net photosynthetic rate(Pn),stomatal conductance(Cond),transpiration rate(Tr) and yield have been measured in the field.The results show that planting density of 97500 plant /hm2 was appropriate for the growth and yield of Liaoza 13.