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As the submersible is widely different from ordinary submarines in both its purpose and its working conditions,special requirements must be met in hull construction,operation control,equipment and communication and navigation systems.Because its energy source is lirriited,the cruising range of the submersible is very small and it has to be carried by other vehicles.Consequently,strict displacement requiremnts must also be met.Therefore,the principle of design and method of analysis of the submersible are greatly ditterent trom those of ordinary submarines.Based on experience in the design of the submersible and some related reserch work,the author made an analysis of the special considerations in the design of submersible,starting from the weight equation and the equation of motion,and obtained the following conclusions.