Although the development of a spectral library has been a hot topic in China and abroad since the '90s, it has defects and cannot meet the demands of theoretical research and application of remote sensing nowadays. The gap is further extended for the featured agricultural remote sensing application in South China. Aiming at establishing a practical spectral library of South China's featured crops (including lichee, longan and sugarcane etc.), crop spectra and their environment parameters, application models are integrated based on Web techniques. The paper concentrates on the spectral data measurement method, store and organization, realization of querying and presentation and Web-interface design. It offers the details of regional featured crop spectra and an application demonstration for remote sensing application of spectral library of featured crops in South China.