jgg     2008 28 (5):  129-132    ISSN: 0412-1961  CN: 21-1139/TG AUTOMATIC LEVELING METHOD FOR BENCHMARK STANDARDS Ou Tonggeng 1,2,3) ;Wang Qi 2,3) ;Fu Huiqing 2,3) ;Lu Jie 2,3) ;Chen Zhigao 2,3) ; and Yang Boxiong 2,3) 1)Institute of Geophysics,CEA，Beijing 1000812)Crustal Movement Laboralory,Wuhan 4300713)Institute of Seismology,CEA, Wuhan 430071 Received: 1900-01-01  Revised: 1900-01-01  Online: null Supporting info null