Method: Descriptive study of cross section thirty IUI cycle of infertile couples - infertility due to cervical causes, lack of sperm, unknown cause during September 2016 June 2017 at 144 Song Hao - Nam Dinh. Results: The average age of the wife is 29.1 ± 3.7.The mean age of the husband was 32.5 ± 4.46; Average mean birth defect was 3.3 ± 1.8 (years); Causes of sterility due to weak sperm, less, deformity accounts for the highest rate: 80%; The hCG-free period was high with 73.3%.