The quark-delocalization colour-screening model is employed to calculate the effective potential between nucleon and kaon.The results show that the potentials are attractive in the Ⅰ=0 channel and repulsive in the Ⅰ=1 channel.The intcractions are very weak between K+n or K0P due to the cancellation between Ⅰ=0 and Ⅰ=1.It is possible to have a high s-wave resonance (1615 MeV),but the width may be too wide to be observed in the experiments.