Ecosystem services are the baseline of regional ecological security. Scientific assessment of their value changes is a basis for rationally planning of the regional land use and constructing ecological security pattern. The existing studies did not comprehensively evaluate various ecosystem services to determine regional ecological basements. The current static assessments failed to reflect the dynamic process of regional ecological security patterns. Hence, using CASA, RUSLE, and other models, as well as the ecological economic method, we evaluated the ecosystem service value in Wafangdian County, Liaoning coastal area in 2000-2014. Then, the two-stage ecological security pattern was constructed based on the scientific assessment. The results are as follows:①during the 14 years, except for the inconspicuous change of nutrient recycling value, the other ecosystem service values have showed different degrees of loss, especially for water source conservation value with the worst decline of 44%. In terms of land use type, the value of forestland ecosystem services lost 874 million Yuan, up to 40% of the total loss. ② For the ecosystem services per unit value of the study area in the two periods, water area (including sea) was higher than land, but mountain was higher than flatlands. This uneven spatial distribution was more obvious in 2014. ③ The ecological source areas in 2000 and 2014 were 1111.40 km² and 356.96 km², respectively. The total length of the corridors were 136.63 km and 231.43 km. The ring-like corridors were distributed in the high value valley of ecosystem service value among the source areas. The profit and loss of ecosystem service value have an impact on the construction of the regional ecological security pattern. The results can provide a scientific guideline for the delineation of urban development boundary and ecological protection red line in Wafangdian.