The evolution of �� phase and its effect on the tensile properties at 700 ��C in 718Plus superalloy after three solution (at 940 ��C for 1 h) and single aging (at 870 ��C for 25 h, 50 h and 100 h) heat treatments, were investigated. The results showed that there were several various morphologies of �� phase in 718Plus samples. As aging time increased, the volume fraction of needle-like/plate-like increased continuously from 5.32%, 7.78% to 29.52%, while the volume of granular/short rod-like �� phase firstly increased from 0.46% to 0.68% then decreased to 0.56%. The high temperature tensile properties were affected by �� phases with various morphologies. With aging time increasing, the ultimate tensile strength was obviously improved from 797.11 MPa to 860.57 MPa, which could be attributed to a certain number of plate-like/needle-like �� phases at the grain boundaries which could hinder the dislocations motion near the grain boundaries. And the elongation weakly increased firstly from 16.84% to 18.76% and then decreased to 18%, which was closely related to granular/short-rod �� phases. Enhancing tensile strength and acceptable ductility could be obtained by morphology control of �� phase applying SA heat treatments in the study: promoting the simultaneous precipitation of an appropriate amount of plate-like/needle-like �� phases and a small amount of granular/short rod-like �� phases.