The invention discloses a method and a system for APP search engine to utilize client comment. The method comprises the following steps: receiving APP search inquiry from a client, determining a plurality of related app based on the received APP search inquiry, extracting APP description and client comment associated with a plurality of APPs from a APP database. The method also comprises steps: pretreating the extracted the APP description and client comment to generate a text corpus, establishing a subject-based language model for the associated APPs based on the generated text corpus; the method further comprises steps: sequencing the associated APPs based on subject-based language model, providing sequecing list of the APPs to the client.