Dry syndrome is a diffuse connective tissue disease characterized by invasion of salivary glands, lacrimal glands and other exocrine glands, it has lymphocytic infiltration and specific autoantibodies. Its three examination items are: 1. Salivary gland testing mainly detects the function of the lacrimal gland ① Salivary flow: saliva is collected at the opening of the parotid duct unilaterally using a special tool to see exactly how much saliva can be secreted. ②Parotid angiography: mainly to see if the parotid duct is narrow, irregular, or dilated. ③Salivary gland radionuclide scan: in order to observe the concentration, uptake and excretion of nuclide (99mTc). 2, lacrimal gland test mainly detects sweat gland function ①Schirmer test: it is used 5mm x 35mm filter paper folded at a right angle at 5mm, after disinfection into the conjunctival sac of the eye, the filter paper is positive if the length is less than or equal to 5mm after wetting. ② tear film crushing time: less than 10 seconds is positive. ③ corneal staining test: use 2% fluorescein as a stain, check the spot of corneal staining under the slit lamp, one side of the staining spot is abnormal if it is greater than 10. 3.The deformation of the lacrimal gland biopsy gland, the expansion of the duct, and the infiltration of other inflammatory cells can cause non-specific changes, which usually cannot be used as a basis for diagnosis. The three examination items of dry syndrome are also called histopathological examination, salivary gland test and lacrimal gland function test. The specific examination items need to consult a specialist, the examination items carried out in different hospitals are different, and other examinations need to be completed if necessary, please consult a specialist for details.