A patent searching method in connection to a matching degree, wherein the patent searching method is applied in a patent searching system to search a patent specification having a plurality of patent sections including abstract, description, and claims, in a patent database, the patent searching method comprising: a keyword designating step of receiving a designated keyword including at least one component keyword so as to determine a searching condition, and a search determining step of determining a matching degree of the patent specification in connection to the designated keyword, wherein there are a plurality of derived patent specifications, and the matching degree of each derived patent specification in connection to the designated keyword is assigned a searching weighted result value obtained by adding up at least one searching weighted value which is assigned to all component keywords belonging to the designated keyword.
