In order to recognize the dynamic change of maternal antibody against peste des ruminants（PPR）in large-scale goat farms in Liuzhou City of Guangxi，173 serum samples of lambs were collected from 6 large-scale goat farms，the lambs were born from ewes that had already immunized with PPR vaccines. The antibody levels in lambs were detected by enzyme linked immunosorbent assay（ELISA）. Results showed that，among the 173 samples，55 of them were PPR-positive，with a positive rate of 31.79%. The PPR maternal antibody level of the lambs was related to the immune time and frequency of the ewes，which was also related to the weaning time of lambs. In addition，the average positive rate of antibody in lambs within 60 days of age was 62%，while the rate in lambs over 60 days dropped to less than 30%. As a conclusion，the earliest immunization time for lambs was about 60 days old. The maternal antibody in lambs could be influenced by many factors，there wasn't a consistent trend for all the lambs，therefore it was necessary to formulate a reasonable immunization program based on the monitoring results.