Abstract: The North Pacific meridional overturning circulation （NPMOC） is the general name of all the North Pacific overturning cells， and it has 5 cells. The tropical cell （TC）， the subtropical cells （STC） and the deep tropical cell （DTC） are located in the TropicalSubtropical region of the North Pacific and are important leakage of the meridional material and energy exchange. Based on NEMO modeling， the mechanisms controlling the interannual variations of TC， STC and DTC meridional transports are studied in this paper. The numerical experiments reveal that TC， STC and DTC all show strong interannual variations associated with ENSO. Both the northward and southward transport branches of TC weaken in El Nio years and strengthen in La Nia years. As to STC， the northward transport strengthens in El Nio years and weakens in La Nia years， while the southward transport weakens in El Nio years and strengthens in La Nia years. The southward transport of DTC decreases in El Nio years and increases in strong La Nia years. The changes in the wind stress is the primary factor of the interannual variations of NPMOC， while the heat and freshwater flux play minor role in the interannual variations of STC and DTC except TC．