Impacts of three pesticides, triazophos, jingganmycin and bisultap, on the export rate of pho-tosynthate of rice leaf were studied with 14C for rice varieties, spraying time and application rate. Dynamics data of photosynthate of labeled rice functional leaves of different treatments were recorded with living plant nutrient detection instrument with multi-probes through tracer method of radioactive nuclide. Compartment analysis model and mathematical equations were constructed using principle and method of kinetics analysis, Impacts of three pesticides, triazophos, jingganmycin and bisultap, on the export rate of pho-tosynthate of rice leaf were studied with 14C for rice varieties, spraying time and application rate. Dynamics data of photosynthate of labeled rice functional leaves of different treatments were recorded with living plant nutrient detection instrument with multi-probes through tracer method of radioactive nuclide. Compartment analysis model and mathematical equations were constructed using principle and method of kinetics analysis,