Considering the large positioning error and high energy consumption concerning irregular and complex 3D plane with obstacles, this paper put forward a new strategy to locate the unknown nodes. This policy divides the complex three-dimensional plane into different logic layers and labels each layer node it belongs to. Then, sub-regions are divided and merged in horizontal layers. Finally, the positioning of 3D complex plane is possible by calculating the location coordinate of unknown nodes after atmospheric pressure sensor ranging. Compared with SV and COLA, the 3D-CCD positioning strategy in the average positioning error is 5% less than SV and 8% less than COLA． Its positioning precision increases more than 6.5%， and the energy consumption reduces 2.7% than SV and COLA. The 3D-CCD has great advantages in terms of positioning error, accuracy and energy.