Nonlinear interactions between the quasi 5-day wave and tides based on meteor radar observation in the Mesosphere and Lower Thermosphere(MLT) at Maui are studied in this paper.Strong sum interaction between quasi 5-day wave and diurnal tide,and evident difference interaction between quasi 5-day wave and semidiurnal tide are observed during the time of attention.However,their difference and sum counterparts are clearly weaker.The secondary waves generated from those interactions beat with the tide and show intense modulation at the period of 5 days which confirms the existence of their interactions.Additionally,correlation coefficients among these waves are calculated to further explore their interactions and find that they can persist for several days although they are highly intermittent.The energy exchange among these waves can be reversible during the observational time.The periods when the significant difference interaction between the quasi 5-day wave and semidiurnal tide occur are much shorter than those when the significant sum interaction between the quasi 5-day wave and diurnal tide occur.Moreover,these two strong interactions can take place simultaneously.In generally,this study provides the proof of nonlinear interactions between quasi 5-day wave and tides which were seldom reported before. Nonlinear interactions between the quasi 5-day wave and tides based on meteorological radar observation in the Mesosphere and Lower Thermosphere (MLT) at Maui are studied in this paper. Strong sum interaction between quasi 5-day wave and diurnal tide, and evident difference interaction between quasi 5-day wave and semidiurnal tide are observed during the time of attention.However, their difference and sum counterparts are clearly weaker.The secondary waves generated from those interactions beat with the tide and show intense modulation at the period of 5 days which confirms the existence of their interactions. Additionally, correlation coefficients among these waves are calculated to further explore their interactions and find that they can persist for several days although they are highly intermittent. the energy exchange among these waves can be reversible during the observational time. The periods when the significant difference interaction between the quasi 5-day wave and semidiurnal tide occur ar e much shorter than those when the significant sum interaction between the quasi 5-day wave and diurnal tide occur. Moreover, these two strong interactions can take place simultaneously. This study provides proof of the nonlinear interactions between quasi 5-day wave and tides which were seldom reported before