In non-uranium geology, there often exists one sort or several sorts of faint radon anomalies, such as ²²²Rn and ²³⁰Rn. To detect these anomalies, themethods chosen for radon survey must be characterized by high sensitivity,high precision and multiparameters. For this reason, techniques of multipara-meter survey such as electrostatic a-card method and a-cup method wereemployed to delimit dykes, distinguish dykes of different properties, search forwater storage structures and determine limits of oil fields. The esultsr obtain-ed obvious1y prove these techniques to be effective.