Abstract: In this paper,the influence of environment condition (temperature and relatively humidity) on diffusible hydrogen content of electrode deposited metal,H_D escape characteristic and the cracking-resistance are studied by cracking test and H_D escape characteristic of (590 MPa) high strength ship structure steel (10CrNi3MoV steel) and special electrode.The research demonstrated that different H_D content and H_D escape characteristic depending on environment condition can produce different result during various cracking test.It is discussed that the slow diffusible hydrogen escaping of later period (H_Ds) is the key factor to effect multi-pass weld cracking test.