In　order　to　reveal　the　influence　of　gentrification　of　Chinese　cities　on　urban　form　and　the　urban　form　characteristics　of　gentrification　neighbourhoods,　the　urban　fuzzy　index　(IUF)　was　applied　to　coordinate　the　characteristic　parameters　of　space　intensity　value　and　space　structure　value　of　urban　form　based　on　two　typical　gentrification　neighbourhoods　in　Shanghai.　Results　showed　that　the　quality　of　urban　form　of　most　gentrification　blocks　were　scored　more　poorly　than　conserved　blocks　or　partly　gentrified　blocks,　which　was　mainly　due　to　high　floor　area　ratio,　closure,　and　space　isolation.　The　gentrification　blocks　with　high　IUF　were　mainly　characterized　by　good　accessibility　and　mixed-use　development.　The　fuzzy　comprehensive　assessment　method　can　objectively　reflect　the　urban　form　characteristics　of　the　research　area　and　supply　an　effective　approach　for　the　quantitative　analysis　of　urban　form.　The　research　results　will　provide　guidance　for　the　formulation　of　urban　reconstruction,　design,　and　planning　schemes.　Copyright　©2021　Journal　of　Harbin　Institute　of　Technology.All　rights　reserved.