| At present, a towed instrument platform that could "fly" up and down in the water column is in front of the towed technology in the world. The project of towed multiple-parameter profile sampling system, which is supported by 863 high technology plan, will develop a new kind of flying towed system. This system is equipped with CTD sensors as well as a variety of other sensors, such as fluorometer, transmissometer, Do, PH, etc. This system is the first flying towed system of China.There are two important parts in the study of the flying towed system. one is appropriate control system, the other is data acquiring and processing system. Because the flying towed system will be used in shallow sea, the control system must be steady and responding quickly. The data acquiring and processing system must be suitable for multiple-parameter quickly sampling, combined calculating, figure displaying.In the paper, based on the analysis of hydrodynamic equation about towed system and the results of the hydrodynamic experiment, a motion model of the towed system was built, which includes four variables: heaven rate, pitch rate, depth, pitch angle. To satisfy the demand of stability and quick response of the controller, a PID wave motion controller is designed. The results of computer simulations and real cruising test in Fuxian Lake show that this controller achieves the expected design requirements.The towed surveying is different from the traditional surveying. Then, the technology of data acquiring and data processing must be suit for the characters, such as synchronous, associated and so on. To get the towed data, a lusty 485-232 mixed communication net and processing soft were designed. To deal with the data, a full set of processes to calculate and export the data was designed. The data processing system was proved to be scientific and reasonable by contrasting the data product with the seabird 917's surveying data. At last, a part of sea test data is processed as an example.
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