To meet the urgent demand raised by the development plan for Lianyun-gang City of Jiangsu Province, geophysicists conducted in1985 airborne remote sensing and comprehensive geophysical survey, ground electrical sounding area measurement, microseismologic network surveillance and transverse wave veloci-ty determination for borehole earth block. Based on the data obtained and the historical seismic data. thin paper has made an evaluation on the stableness of geological structures in Lianyungang area. According to integrated remote sen sing and geophysical prospecting data, some 2,000km² of Lianyungang urban area has been divided into four foundation types. It is pointed out that the five diluvium divisions are areas suitable for construction, that the widely-distributed mud layer area has weak anti-shearing capacity and considerable sedi mentation rate, and that the ancient stream channels and sand layer subareas in the mud layer area have the potential danger of sand soil liquidation.The field foundation and seismic intensity zoning was made according to horizontal acceleration spectra of the field foundation, indicating that areas of type Iand type IIhave, favorable engineering geologic conditions. Using statis tical methods, this paper also predicts probability for earthquakes of magnitude 5 in 50 and 100 years.