NIR detecting mode is adopted to detect moisture-content of NC, dehydrated with hot wind, avoiding the shortage of traditional sampling- analyzing offline. The surroundings, dehydrating Nitrocellulose with hot wind in it, is very dangerous. The restrictions on the application of the method of measuring content of moisture to nitrocellulose, dehydrated by hot wind, based on NIR in the surroundings, told above, is analyzed. With the security and the veracity of application of NIR analyzed, effective measure is chosen to insure the achievement of measuring with NIR. The test data shows that the NIR method can deal with the measure of moisture-content of NC safely and accurately. The method to integrate the platform of NIR surveymeter with PLC control system is designed to achieve the application of measure of moisture- content of NC accurately online with field controller.