Objective:To explore the relationship between β-human chorionic gonadotropin(β-HCG),human placental lactogen(HPL) and multiple pregnancies by measuring β-HCG and HPL in early pregnant women. Methods:The serum levels of β-HCG and HPL in 18 women with multiple pregnancies(including two and three fetuses) were measured every two weeks from the 5th week of pregnancy to the 11th week; other 35 women with single fetus in the same period were taken as controls. Results:The serum level of β-HCG was significantly higher in multiple pregnancies group than in single pregnancy group during the 5-9th week of pregnancy (P<0.05). There was no significant difference in serum level of β-HCG between the two groups at the 11th week of pregnancy(P >0.05). The serum level of HPL was not significantly different between the two groups at the 5th week of pregnancy(P >0.05). The serum HPL was significantly higher in multiple pregnancies group than in single pregnancy group(P<0.01) during the 7-11th week of pregnancy. Conclusion:Obvious increase of β-HCG and HPL in early pregnancy indicates multiple pregnancies,which should be alerted.