The moisture measurement of undissolved solid, grease and gas is studied based on the principle of Karl - Fishcher coulometry, which cannot be conducted directly by CA - 06 moisture equipment. Through online of carrier gas, evaporating apparatus and host machine of moisture detector, a moisture detecting system of solid, grease and gas is constructed. The application of CA - 06 moisture equipment has been successfully expensed. The moisture measurement has good repeatability and reliable analytic results as well as high degree of accuracy. Experimental studies on foam materials, fumed silica, polyurethane foam and silicone as well as higher pure hydrogen are conducted by this technique and excellent measurement results are obtained.