Title On the harmonic vector elds Type of Research Presentation Keywords Energy functional, Isotropic almost complex structure,Tangent bundle, Tension field Abstract An isotropic almost complex structure J; defines a Riemannian metric g; on the tangent bundle which is the generalized type of the Sasaki metric. In this paper, the harmonic maps defined by vector fields are studied where the tangent bundle will be equipped with the metric g;. Researchers Amir Baghban (First Researcher)، Esmaiel Abedi (Second Researcher)