An apparatus for state detection, comprising: an electric charge sensing element arranged on a mobile terminal; an electric charge collection circuit connected to the electric charge sensing element; and a state detection module connected to the electric charge collection circuit; the electric charge sensing element is configured to radiate electric charge generated by the electric charge collection circuit, and transmit reflected electric charge to the electric charge collection circuit; the electric charge collection circuit is configured to generate electric charge and radiate the electric charge out through the electric charge sensing element, and collect the reflected electric charge from the electric charge sensing element to generate an induced electric charge value of the electric charge sensing element, and output the induced electric charge value of the electric charge sensing element to the state detection module; the state detection module is configured to determine a state of the mobile terminal according to the induced electric charge value; the electric charge collection circuit is configured to obtain a value of time difference from an emission of the electric charge to a reception of the reflected electric charge, and send the value of time difference to the state detection module; characterized in that the state detection module comprises a material identification unit, the material identification unit is configured to determine a distance between the mobile terminal and the object according to the value of time difference, and search from a preset correspondence table of the induced electric charge value, distance, and material to determine the material of the object currently contacted or approached by the mobile terminal according to the induced electric charge value and the distance. an electric charge sensing element arranged on a mobile terminal; an electric charge collection circuit connected to the electric charge sensing element; and a state detection module connected to the electric charge collection circuit; the electric charge sensing element is configured to radiate electric charge generated by the electric charge collection circuit, and transmit reflected electric charge to the electric charge collection circuit; the electric charge collection circuit is configured to generate electric charge and radiate the electric charge out through the electric charge sensing element, and collect the reflected electric charge from the electric charge sensing element to generate an induced electric charge value of the electric charge sensing element, and output the induced electric charge value of the electric charge sensing element to the state detection module; the state detection module is configured to determine a state of the mobile terminal according to the induced electric charge value; the electric charge collection circuit is configured to obtain a value of time difference from an emission of the electric charge to a reception of the reflected electric charge, and send the value of time difference to the state detection module; characterized in that the state detection module comprises a material identification unit, the material identification unit is configured to determine a distance between the mobile terminal and the object according to the value of time difference, and search from a preset correspondence table of the induced electric charge value, distance, and material to determine the material of the object currently contacted or approached by the mobile terminal according to the induced electric charge value and the distance.