Abstract: Taking tomato ‘micro tom’ as the experimental material, a pot controlled experimental method was adopted.Two irrigation amounts of 300 and 450 mL·pot^-1（N0）were set each time, denoted as W300 and W450,with four different nitrogen application levels of 0 g·kg^-1（N0）,0.08 g·kg^-1（N1）,0.16 g·kg^-1（N2）,and 0.32 g·kg^-1（N3）.Two growth stage experiments were conducted.The chlorophyll content, growth and development dynamics, yield, and quality of potted tomato leaves were used as research indicators, in order to obtain the dynamic distribution pattern of assimilates during tomato growth stage and provide reference for rational water and nitrogen management in tomato production.The results showed that the growth and development of tomatoes followed a logistic curve.In the two quarters of the experiment, the highest yield occurred under the W450N2 treatment, reaching 195.24 g and 201.23 g, respectively, which were 1.62%-50.47% and 1.91%-52.69% higher than other treatments.Reasonable water and nitrogen management can maintain the maximum accumulation rate of above-ground dry matter for a long time, ultimately improving tomato yield.