Laser　powder　bed　fusion　(LPBF)　technology　is　one　of　the　most　widely　used　forming　technologies　in　the　field　of　metal　additive　manufacturing　because　of　its　high　forming　accuracy,　low　surface　roughness,　and　excellent　performance　of　the　formed　parts.　In　this　paper,　we　review　the　factors　influencing　powder　packing　density　in　LPBF　technology,　which　is　a　key　part　of　LPBF　technology.　First,　the　methods　of　powder　bed　quality　characterization　and　evaluation,　such　as　image　analysis,　X-ray　in-situ　monitoring,　and　sampling　method,　are　summarized.　On　this　basis,　the　influence　of　powder　particle　size,　powder　morphology,　powder　preparation　method,　powder　recycling,　and　powder　recoating　process　parameters　on　the　powder　bed　packing　density　is　described　from　powder　characteristics　and　powder　recoating　process,　respectively.　Among　them,　the　particle　size　distribution　and　morphology　of　the　powder　are　the　key　factors　affecting　the　powder　packing　density,　and　the　wider　single-peak　distribution　and　the　bimodal　distribution　of　coarse　and　fine　particles　are　favorable　to　improve　the　powder　packing　density;　the　closer　the　powder　morphology　is　to　spherical　shape,　the　better　the　powder　flowability　is,　which　is　favorable　to　improve　the　powder　spreading　homogeneity.　The　powder　packing　density　and　spreading　homogeneity　together　will　improve　the　powder　bed　packing　density　and　the　density　of　formed　samples.　The　change　of　powder　recoating　process　conditions　can　influence　the　powder　spreading　quality　and　packing　density,　among　which　controlling　reasonable　recoating　speed,　choosing　roller　type　scraper,　and　increasing　the　roughness　of　substrate　will　further　improve　the　powder　bed　packing　density.　Finally,　this　paper　presents　the　prospect　of　methods　and　techniques　to　further　improve　the　powder　bed　density.　©　2024　Universitat　zu　Koln.　All　rights　reserved.