A method, an apparatus, and a system for mobile search are provided. The method for mobile search includes: receiving a search request, where the search request carries keyword information to be searched for, and an instant interest model and a long-term interest model acquired by a search application server; calculating a relevance score value of each member engine according to the search request, meta index information of the member engine, the instant interest model, and the long-term interest model; and selecting one or more member engines according to the relevance score value to search for the keyword information. The searching for the keyword information may integrate an instant interest model and a long-term interest model of a user, so as to provide users with personalized and highly accurate search result information that meets demands.