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With consumers’ requiring day by day for automobile appearance and quality, make a small amount, style diversification is the main goal for automobile factory now. The life cycle of the new style is shorter and shorter, the operation of each new style needs to invest relative quantity of welding jigs ,so put forward higher request quality in welding jigs of design and manufacture.As for market competitiveness of automobile factory, how to guarantee the precison of automobile body within allowed error range is urgent request.The purpose of this paper is to probe into the questions and improvement of jig’s precison, firstly describe assemble process of sheet materials ,secondly explain the important works of jig’s design and manufacture.Take a precision example of assembly hole,explain existing questions and bring up improved tactics, increase jig’s x , y direction of vice datums, reduce assembly process of sheet materials , and reduce the error range of sheet material and connection of sheet materials.In the future hopefutly,apply this paper of analysis and improved tactics to other inaccuracy sections of automobile bodies, improve the whole automobile body of accuracy rate.
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