Abstract: By means of coordinate transformation, the part of stressesin the expression of stress field caused by temperature at the moment ofapplication of transient current on the platewith a side-crack was separated and expressed in polar coordinate. The stress field near the penetrate crack tip of type I was obtained.Through adding the stress field caused by temperature to the stress causedby tension loaded in the distance, the stress field in the current-carryingplate with a side-crack under the action of mechanical loading could beobtained in polar coordinate. An example is provided.