Abstract: By using CATIA software, 3D model of DL503 working devices was established. Then in order to simu-late whole working device system,we converted the 3D model document into an acceptable type to import in AD-AMS environment. To optimize the bucked translation,firstly,key points of the model were defined as design vari-ables and bucket translation as objective function. Secondly,boundary constraint functions and performance con-straint functions were established. Finally,by optimization analysis,the optimized scheme and curves for buckettranslation were obtained. From the curves,we can see that bucket swing angle has been greatly reduced,andtranslation performance has been improved.