A　kind　of　chainlike　distribution　solution　inclusions　in　KDP　crystals　were　observed　by　microscopy　and　SEM.　The　size　of　these　inclusions　was　from　several　to　dozens　of　microns.　They　mainly　arranged　along　the　crystal　edges.　With　analyzing　the　formation　conditions　and　mechanism　of　these　solution　inclusions,　the　relationship　between　their　formation　and　the　mechanism　of　growth　from　the　edges,　which　new　developed　in　recent　year,　was　found.　Possible　reasons　of　inducing　the　growth　mechanism　of　growth-step　generation　from　the　edges　were　discussed.