Abstract: Some errors are inevitably produced while using the homogeneous canopy photosynthesis model to simulate the cucumber photosynthesis rate of heterogeneous rowed crop canopy in sunlight greenhouse. So in this paper, the improved models were proposed which regarded the leaf photosynthetic trait and the light penetrating into row cucumber crop canopy heterogeneously, it is composed by the model of photon transport in heterogeneous leaf canopy and the empiristic formula which described regression between leaf age and maximal photosynthesis rate and use efficiency of sunlight. The simulation of the light distribution in canopy was validated, and the results show the calculations and measures were fitted well when plant height adopted in model was less than 1.2m. And the sum of total leaf photosynthesis rate was caculated in the per volume leaf age and photosynthesis trait of canopy was assured by using the simulation distribution of photosynthesis active radiation(PAR) in canopy and empiristic formula which described regression between leaf age and photosynthesis trait, but experiments are needed for further validation of these results.