Objective To explore the characteristics and population differences of weight self-management in pregnant women, so as to provide a reference for developing targeted intervention. Methods A total of 15 pregnant women were selected using purposive sampling for semi-structured interviews,and the data were analyzed by Colaizzi seven-step method. Based on the self-management theory, the weight self-management characteristics of pregnant women were extracted manually, and the visualization of the user persona was completed by word cloud and table. Results Five characteristics were extracted: basic characteristic, cognitive characteristic, behavioral characteristic, social support characteristic and psychological adjustment characteristic; four typical user personas of weight self-management in pregnant women were constructed:autonomy and self-discipline type, powerless type, laissez-faire type and blind practice type. Conclusion There are large group differences of weight self-management in pregnant women, so personalized and precise management programs can be provided according to the group characteristics of different user personas.