With　the　rapid　development　of　the　Internet,　virtual　communities　are　constantly　emerging.　While　these　communities　provide　innovative　resources,　there　are　also　problems　such　as　the　low　willingness　of　users　to　share　and　a　lack　of　good　incentive　mechanisms.　Blockchain　can　better　solve　these　problems　and　promote　community　knowledge　sharing.　This　paper　constructs　an　online　community　knowledge　sharing　scheme　based　on　Multi　Chain,　proposes　the　resource　access　and　storage　mode　of“metadata　&　cloud　storage”,　designs　the　metadata　information　table　in　detail,　and　designs　the　overall　framework　of　the　knowledge　sharing　scheme　and　the　key　processes　of　some　businesses.　Based　on　the　key　process,　the　consensus　mechanism　of“Nominated　Proof　of　Stake　(NPOS)”is　proposed　to　design　the　block⁃　chain　network,　which　realizes　some　functions　of　online　community　knowledge　sharing.　Through　analysis　and　experi⁃　ment,　the　scheme　of　this　paper　has　good　scientific　rationality,　safety　and　execution　efficiency,　and　has　good　reference　value　for　the　development　of　other　related　projects.　©　2022　Hunan　University.　All　rights　reserved.