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In order to implement the on-line placement of module/component on reconfigurable devices,an on-line placement strategy based on space manager and fitter is proposed.For the space manager,it is proposed to manage the occupied space rather than the free space on the device,so that the occupied space will be used more quickly to find the set of free places where the new component can be placed.The concrete implementation is to calculate the IPRs relative to the device and each placed components so as to get the set of IPRs,and then the set of free places where the new component can be placed is obtained by subtracting the set of IPRs from the total device area.For the fitter,the point at which the placement routing cost is optimal,namely the best point to place the new module,is first calculated,and then the point must be checked if it belongs to the PPR set,and if so,the solution to the problem is obtained,if not,the nearest possible position to the optimal point will be found and it is selected as the best placement position.Experimental results show that the proposed space manager and fitter not only have lower complexity but also lower fitting time compared with several methods commonly used at present.