The spatial span of the current phase distribution of near-field long antenna is large. To solve the difficult problem, an ultra-high frequency (UHF) near-field long antenna based on capacitance loading is designed in this paper. By dividing microstrip transmission line of 250 mm in length into several segments and loading capacitances of 1.6 pF in each 48.8 mm of the patch, the phase of electric current can be compensated. Metal branches and resistance are adopted in port to realize impedance matching. Simulation and research show that the return loss is below -10 dB between 918—933 MHz, the max difference of electric field is only 3.2 dB in 300 mm above the antenna, and the maximum difference of read distances in different positions is below 95 mm. The results show that the antenna is of good near electric field uniformity. The antenna is also measured in the radio frequency identification (RFID) system and the practicality is verified in near field application.