Measurement is a essential part in all kinds of industry, especially in manufacturing. But until now, measurement hasn't been located to the core of manufacturing in domestic. This improvement guide line for the multilateral problems of measuring instrument investigation of small and medium-sized enterprises. To use measuring treat it must be accustomed with the structure, the performance, the method. must be corrected periodically. The correcting-schedule is established with accuracy, stability, purpose, condition, and frequency.