Abstract: Objective To investigate the proportion and influencing factors of delay on HIV diagnosis among newly reported HIV-infected Myanmar patients in Dehong area of Yunnan Province in 2015. Methods Sociodemographic characteristics, routes of infection and other information of interest for newly reported HIV/AIDS Myanmar patients in Dehong area were collected through the National Information System for Comprehensive AIDS Prevention and Control. Results Among 526 patients, 110(20.9%) were subject to late HIV diagnosis. Multivariable Logistic regression analysis showed that patients aged 25-34 (OR=2.72, 95% CI:1.33-5.56, P=0.006) or ≥35 years old (OR=4.93, 95% CI:2.29-10.63, P<0.001) were more likely to be diagnosed later than those age < 25 years old. Patients from medical institutions (OR=3.15, 95% CI:1.48-6.71, P=0.003), voluntary counseling and testing clinics (OR=5.48, 95% CI:2.66-11.31, P<0.001) and those spouses or sex partners with positive HIV(OR=3.08,95% CI:1.47-6.44,P=0.003) had higher proportion of delayed diagnosis compared with detained people. Conclusions The proportion of delayed diagnosis among newly reported HIV-infected Myanmar patients in Dehong area is relatively high in 2015. HIV testing should be scaled up among Myanmar people so as to detect HIV infection early and provide antiviral therapy in time.