Abstract: FPGA basic logic elements structure has a huge impact on its performance.By experimental method,a series of benchmark circuits to be packed,placed and routed,and study the place and route effects of the different structures based on three different FPGA basic logic elements (BLE) structure.Our research shows that different BLE structures have a large impact on placement cost,place and route's delay,and area.BLE_C structure has better optimization results in placement,routing delay and area.The experimental results have some reference value to FPGA architecture designand EDA tools design.