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High-performance slag concrete is more likely to cause the emergence of crack than common concrete. In view of this problem, this paper introduces the forming mechanism of crack in concrete structure and puts forward the corresponding measures and methods. Generally speaking, the internal and external temperature difference at early stage and the basic difference of temperature at later stage are considered as the main factors making appearance of crack, while the external heat preservation and internal cooling pipes measures can achieve better effect on preventing cracks. Under the basic theories of temperature field and stress field of concrete, the 3-D FEM with the numerical algorithm of pipe cooling is adopted to simulate the thermal field and stresses field of estuarine sluice during construction. The results show that good effect of temperature control and crack prevention is achieved. This research should have great reference signification to similar concrete projects in the future.