Based on ARM and DSP, an real-time agricultural information sampling terminal was designed. S3C2440 and TMS320C6713 was used as the main processor and the assistant processor, repectively. The principle of HPI interface was expounded. The HPI device driver and the collection of electric circuits for the farmland information were designed. By using Multisim, the emulation verification which could be amplified were made to the electric circuits. The collected latitude and the longitude of the farmland, image information, soil temperature, moisture, strength of illumination and other information were encoded. The experiment on the farm showed that various sensor information could be collected and uploaded reliably by this system. The time-lapse experiment showed that images were usually demonstrated incompletely when GPRS net delayed too much.