Objective To evaluate the satisfaction to and demand on vaccination service among children's parents and medical workers in Shenyang city with a mobile phone application (APP) supported survey and to provide references for effective utilization of big data information management system in improving capability of vaccination service.

Methods We conducted an online survey among parents of 0 – 7 years old children having planned immunization vaccination and medical workers engaged in the vaccination service in Shenyang city in 2017. Questionnaires of two versions were administered to all clients of a mobile phone APP named "Jin Miaobao" in vaccination information management system to collect relevant information.

Results Valid information were collected from 98.97% of 290 medical workers and 96.63% of 18 259 parents totally. The surveyed medical workers reported that both the number children and vaccine doses covered by planned immunization vaccination increased due to the enlargement of permanent residential population but the number of medical institutions and staff supplying the vaccination service decreased continuously; the medical workers also reported a heavy workload, especially those working in urban regions. Logistic regression analysis demonstrated that the satisfaction to work was influenced mainly by the number of outpatient visits, attitude towards workload, salary, and career development. Of the parents with valid replies, 42.53% reported getting the knowledge on vaccination from the medical staff providing the inoculation service and 83.06% were satisfied to vaccination services for their children.

Conclusion Establishment of stable, professional and active teams, optimization of inoculation process, and improvement of service and facility of vaccination clinics are important for effective implementation of expanded program on immunization. Mobile phone application could be utilized in the improvement of vaccination service.