Aiming at the corrosion of the heat-affected zone（HAZ） of the weld of stainless steel close packed pipe joint,the test pieces are prepared with the same base metal,welding structure and welding procedure and are removed the oxide layer generated in the welding process by different surface treatment methods,and the simulated corrosion test is carried out to compare and observe the surface corrosion resistance status of the material surface after removing the oxide layer. The reason of rust in the heat-affected zone of the weld is determined by intergranular corrosion test,electrolytic corrosion test and metallographic microscope observation,and on this basis,the solution is put forward combining with the verification test.