A new system named Home-Explorer is proposed to search and localize physical artifacts in smart indoor environment. Our view is object-centered and sensors are attached to several objects (named smart objects) in the space. Different from others? research, our system tackles not only smart objects but also hidden objects (e.g. no sensor attached objects). Home-Explorer resolves the hidden object problem by reasoning the physical context from smart objects. A series of inference rules are presented for context reasoning. Moreover, in order to deal with the uncertainty problem when estimating the identity of the hidden objects, we present two effective ways: attribute matching mechanism and associated relation method. Besides, to enhance userfriendly, multiple search modes are provided.