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The planar edge termination techniques of junction termination extension (JTE) and offset field plates and field-limiting rings (OFP-FLR) were investigated and optimized using a two-dimensional device simulator TMA MEDICI. By experimental verification, a good consistency between simulation and experiment can be observed. The results show that the p-i-n diode with an optimized JTE edge termination can accomplish near ideal breakdown voltage and much lower leakage current. The breakdown voltage can be higher than 1800 V, which achieves more than 90 percent of ideal parallel plane junction breakdown voltage, and the leakage current density can be as low as 2X10-4 A/cm2.