Electroactive polymer (EAP) has a wide range of applications in real life. As one of its typical applications, the dielectric EAP cylindrical actuators are affected in output lateral deflection force and lateral bending angle by the tensile area ratio of dielectric EAP film, the number of winding layers of dielectric EAP film and the coating area ratio of flexible electrode, which needs to be further studied to determine the law of action. In view of the influence of these factors on the lateral performance of the output of dielectric EAP cylindrical actuator, a test device was designed and manufactured, and a large number of test data were measured through the control variable test. The action law of the influencing factors was preliminarily obtained by analyzing and processing the test data. The results showed that the output lateral deflection force and lateral bending angle of the dielectric EAP cylindrical actuator are all affected by the tensile area ratio of the dielectric EAP film, the number of winding layers of the dielectric EAP film and the coating area ratio of the flexible electrode. These factors have different effects on the output lateral performance.