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0.53。 The hardware system of an intelligent detection for growing crop was developed based on multi-sensor information. The stable light source was obtained from the detection chamber, and the temperature, humidity and lighting levels could be set in the system that could be used to simulate some growing environment of crops. The information including the spectrum information, multi-spectral image, canopy temperature and canopy lighting level for crops and ambient temperature, humidity information was collected by multi-sensor information acquisition system by which the crop growth information could be monitored effectively. Then, the system was used to detect the spectral and the multi-spectral image characters for the rape nitrogen level and the water content. Meanwhile, the influence of the light intensity was investigated for the detection system. The results showed that the influence of the environment factor on the results can be eliminated. The exact and quantitative analysis about the rape nitrogen content and the water content can be carried out by means of the multi-sensor information technology. The linear relationships between nitrogen content and spectral reflectance value is 0.92, with the RMSE of 0.53.