The paper is based on PLC plasma deposition of Fe-base powder,the factors influencing the deposition layer appearance by deposition current、deposition speed and powder feed speed were researched,the infect disciplinarian was mastered and the mechanism was analyzed.The conclusion as follows: Along with the deposition current increasing,the deposition speed decreased and the powder feed speed increased,the wide of the layer increased along with the deposition current increased,the deposition speed increased and the powder feed speed decreased,and the height of layer decreased.