With more and more supply and demand flows joining to the supply and demand network,accurate and effective searching strategy becomes the key technology which makes supply and demand network bring into effect.A new searching method is proposed in which using XML(extensible markup language) and RDF(resource description framework) of semantic web,the current FOAF(friendofafriend) vocabulary is extended,collaboration associates are searched in RDQL,RDF data inquiring language and an actualizing frame is set concretely.