Ex-Vessel Neutron Dosimetry (EVND) systems had been used worldwide in nuclear power industry because of its easier implementation, higher reliability and lower cost compared to in-vessel surveillance capsules. EVND system measures reactor pressure vessel (RPV) neutron fluence and neutron spectrum with multiple activation foils installed outside of RPV. A special EVND system was designed and manufactured for Tianwan Nuclear Power Plant VVER-1000 reactor units in China, based on the characters of their fuel scheme, reactor internals, RPV and also the components and structures outside of RPV. The EVND system was composed of six dosimeter sets which were installed in six different locations. Each dosimeter set had eight foils. Stainless steel chain which was used to support the dosimeter sets also provided useful information to describe the axial distribution of reactor neutron fluence. The system was installed during the 11th refueling outage and was withdrawn after one fuel cycle. Then the activated foils were measured and analyzed to obtain the reaction rates of target nuclides. Neutron transport calculation was carried out to obtain neutron fluence and neutron spectrum distribution. Spectrum adjustment calculation was carried out to obtain best estimated neutron fluence based on dosimeter measurement results. Calculated, best estimated and measured reaction rates were compared for each foil. Also, calculated and best estimated neutron spectrums at each dosimeter set location were compared. Finally, correctness of RPV fast neutron fluence and spectrum was assessed based on these comparisons. The results showed that the calculated, measured and best estimated reaction rates of most dosimeters complied with each other very well. It can be concluded that the EVND system can provide accurate RPV neutron fluence for Tianwan VVER-1000 reactor units.