Porous　anodic　alumina　(PAA)　is　a　typical　template　for　electrochemical　deposition.　The　longitudinal　disarranged　growth　(LDG)　in　a　PAA　template　directly　causes　a　distortion　of　deposited　nanomaterials.　Crystallographic　orientation　is　an　important　parameter　of　aluminum　(Al)　and　its　influence　on　PAA　longitudinal　growth　is　the　key　to　high-quality　PAA　templates.　In　this　study,　PAA　films　prepared　from　polycrystalline　pure　Al　foils　were　used　to　investigate　the　key　effects　of　crystallographic　orientation　on　PAA　LDG.　A　spatial　mapping　relationship　between　crystallographic　orientation　and　PAA　morphology　was　built　using　a　scratch　marking　method　with　a　combination　of　electron　backscatter　diffraction　and　scanning　electron　microscopy.　The　results　showed　that　PAA　LDG　man-ifested　as　LDG　regions,　whose　size　was　positively　correlated　with　grain　boundary　misorientation.　The　effect　of　misorientation　on　the　LDG　was　explained　based　on　the　volume　expansion　model.　This　study　contributed　to　a　further　understanding　of　the　PAA　longitudinal　growth　mechanism.