First of all, the samples required to be submitted for inspection are fresh, clean and typical. For adult pigs, the anterior vena cava or ear vein can be used to collect blood to detect swine fever, pseudorabies, pig blue ear, ring, small, foot-and-mouth disease, epidemic diarrhea, JE antibody and other items, the general number of samples is ≥ 10, 3 to 4 times a year. Only normal pigs can be used as healthy samples. For the sampling of diarrhea pathogens, it is recommended to collect feces and corresponding intestinal (including mesenteric lymph node) samples; for respiratory diseases, lung or lymph nodes can be collected; for reproductive disorders, aborted fetal tissue can be collected.