Abstract: The necessity of constructing conformity platform of Chinese agriculture information resources (Professional Search Engine for Agriculture) was analyzed thorough the survey of actuality of agriculture information development in China. The development and tendency of Professional Search Engine (PSE) was also involved in this paper. The framework of a PSE for agriculture (NOVA Chinese PSE System for Agriculture) is put forward, and also the principal techniques for PSE for Agriculture such as Web Crawler/Spider, Text Categorization, and Indexing & Search etc. are discussed.