An improved rigid fixed butt crack test method is used to analyze the influencing factors of cracks in the welding of ceramic cored wire with ceramic backing. Through analysis,it is found that the cracks are solidification cracks,and there are many factors that affect the generation of cracks. By designing the composition of the weld metal,the crack sensitivity can be predicted by using appropriate criteria. Welding current has an important effect on cracks. As the current increases,the crack sensitivity of the weld metal gradually increases. At the same time,the cracks is the result of the combined effect of metallurgical factors and process factors. The cracks can avoid by appropriate composition design and parameters.