Electric　fields　associated　with　dynamic　space　charges　injected　from　metallic　needle　electrode　immersed　into　XLPE　sample　are　analyzed　by　means　of　computer　simulations.　Field　distributions　in　the　material　are　calculated　utilizing　bipolar　charge　transport　model.　It　is　shown　that　the　accumulated　space　charge　becomes　significant　with　time　and　affects　the　electric　field　distribution　in　the　sample.　The　obtained　magnitudes　and　profiles　of　the　resulting　fields　are　discussed　focusing　on　possible　mechanisms　of　electric　tree　inception　in　the　material.