A modification of the HS formula is introduced for unconstrained optimization problem.In the proposed algorithm, the new formula possesses the sufficient descent property without any line searches.

• 给出修正的HS公式，并且将其应用到无约束优化中，得到一类新的共轭梯度（型）算法，新的公式不需要任何线搜索可以保持充分下降性。