Objective To observe the changes of macular morphology and visual function in post pole small circumscribed choroidal hemangioma (PSCCH) by single photodynamic therapy (PDT). Methods A retrospective selfcontrolled study was performed in 11 patients with PSCCH who underwent PDT in our hospital from January 2014 to January 2019.According to fundus photochromy (FP)，fundus fluorescein angiography (FFA)，indocyanine green angiography (ICGA)

Bmode ultrasound

and optical coherence tomography (OCT)

changes of the best corrected visual acuity (BCVA)，foveal subretinal thickness (FSRT)，maximum diameter and thickness of the tumor were evaluated. All the patients received PDT one time

and they were followedup for 1 to 24 months. Results Postoperative tumor shrinkage was observed in all patients

and the thickness of the tumor was reduced from (2.318±0.725)mm to no data can be measured.The subretinal fluid was absorbed，the exudative detachment was relieved，and the foveal morphology returned to normal.The FSRT was reduced from (876.09±483.74)μm to (201.9±62.6)μm

with statistically significant difference (P<0.05).The BCVA of 11 patients increased from (0.27±0.33) to (0.35±0.40)

and the difference was statistically significant (P<0.05).None of the patients had treatmentrelated complications.And there was no recurrence of the tumor during the followup period.Conclusion A single PDT for the treatment of PSCCH can reduce the tumor volume

restore the macular morphology，and stabilize the visual function.