The evaluation of the suitability of the geological environment for engineering construction is the basis for the preparation of territorial spatial planning. Take Lianyungang as an example to explore the integrated evaluation index system and method for the suitability of above- ground and underground engineering construction. Integrated evaluation is a spatially integrated decision- making problem, involving multiple factors at multiple levels. Drawing on the negative list model in the economic field, an integrated evaluation index system is established based on the negative list of natural factors. The difference is more obvious between above- ground and underground evaluation indexes of integrated evaluation. The above- ground evaluation considers 11 factors such as terrain slope, foundation bearing capacity and pile depth, while the underground space evaluation does not consider factors such as terrain slope and pile depth. Based on the comprehensive evaluation method of hierarchical analysis and entropy weighting coefficient method to determine the weight of evaluation index, the multi- objective linear weighting function model using GIS platform was used to carry out the integrated regional evaluation of engineering construction. The evaluation results show that: the areas of good and better engineering construction suitability are widely distributed, accounting for 73.94%~93.22%. With the increase of vertical depth, the area of the areas with good geological suitability for underground space development increases significantly. The suitability of above- ground space is mainly affected by soft and corrosive soils and geological hazards. The geological suitability of underground space development in the shallow layer (0~15 m) is mainly affected by the s shallow- buried thick layer of soft soil, and the underground space development faces the risk of soft soil deformation. The geological suitability of underground space development in the sub- shallow layer (15~30 m) and the sub- deep layer (30~50 m) is mainly influenced by the influx of water from the sand layer and the rock—soil interface. Judging from the evaluation results, the suitability of underground space construction is better than that above ground. It is recommended that underground space be divided into 3 vertical layers, fully exploiting the above- ground space above 15 m, planning ahead for the sub- shallow and sub- depth underground space, and avoiding the general and poor suitability areas as far as possible. Good suitability areas and better areas should be taken into account when preparing the national spatial planning.