The dry chemistry technique uses the liquid present in the sample under test as the reaction medium, and the component under test reacts directly with the dry reagent cured on a carrier. Dry chemistry is an analytical method based on an enzymatic method, also known as solid-phase chemistry or dry reagent chemistry, in which the moisture of the sample under test acts as a solvent to produce a specific chemical reaction on the corresponding dry reagent paper. Dry chemistry is currently used in a variety of clinical tests because of its simplicity and accuracy. Dry Chemistry has many features, such as high accuracy and speed, generally in 3~4 minutes can get the results; easy to operate, without the need to store other reagents or prepare any solution; samples do not need to be processed, and the amount of samples is small sensitivity; but also can be used to replace the wet chemical method for emergency specimen testing in special circumstances and the evaluation of the results of the routine test, and so on. Dry chemistry can not only be used for qualitative examination, but also further developed into quantitative and semi-quantitative analysis methods, has become an important method of clinical testing. For example, it is widely used for the qualitative detection of urine, and some test strips can be used for the simultaneous detection of a variety of items such as urinary protein, urinary glucose, bilirubin, ketone bodies, and so on.