This paper reported a pregnant woman with spinal muscular atrophy（SMA） type Ⅲ, who received caesarean section under ultrasound-guided transversus abdominis plane block combined with ilioinguinal-iliohypogastric nerve block and intravenous anesthesia. This paper recommend this method as a back-up choice for obstetric anesthesia, especially for those patients who suffer from SMA, or those who has contraindications to general anesthesia or neuraxial anesthesia.